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Monday, March 12, 2018

82. CHORD-INDEPENDENT AND UNACCOMPANIED MELODIES: THE TWO NOTES STATISTICAL HARMONY. The chromatic , melodic and harmonic melody notes transitions (speeds)

So far in post 9, we have developed the chord-progression first and afterwards  the melodic themes, system of musical composition, which is mainly the pattern that takes place in improvisation , especially in jazz. 

The main reason for this, is of course,  because chord progressions is a simpler pattern than the melody. But what if the melodic themes is a simpler pattern than the chords progression? 

We must remark here that there melodies that either

a) No single chord is best for accompany it all 

b) or any chord can accompany it.
c) Too many chords fast changing (ghost chords) are appropriate to accompany it.

d)  A small number of chords but only very fast changing (ghost chords) are appropriate to accompany it.

THE STATISTICAL TWO-NOTES  HARMONY

What if the melodic theme is as here the simplicial melodic themes  which is simple a melodic interval of two notes (actually melodic vectors as orientation does matter) which is simpler than the 3 notes of  chord, and we start composing the melody with such melodic intervals? From this point of view there are only 3 types of such simplicial melodic themes: 1) Of intervals of 2nd and inverses (Chromatic transitions)  2) of intervals of 3rd and inverses (melodic transitions)  3) of intervals of 5th or 8ths and inversions (Harmonic transitions) .

These three types of transitions of notes , namely chromatic, melodic and harmonic are like the three basic relations of chords transitions (see post 30). So improvisation of a melody which is sounding alone without chords underlying it, but probably only some rhythmic percussion can be conducted solely by choosing each time how much melody, harmony or chrome we want!  

See also post 68 about the 3 melodic densities or speeds (chromatic, melodic, harmonic)

In the context of 2-notes harmony or Interval harmony of melodies the closest counterpart of a chord is an interval of 5th or its  inverae an interval of 4th. Oscillations between tow notes at an interval of 5th or 4th is the counterpart of the guitar harping within a chord.



Of course we can afterwards add 3-note or 4-notes chords and study such an harmony of the melody. But the visible and undisputed harmony of the melody is the two notes harmony, or the statistics and sequence of intervals of the melody.
If such a two-notes harmony was tried to be covert it to a 3-notes chords harmony, not only the extension would not be unique, but also it may be that a close fitted such extension might give a so much fast changing chord progression, that would rather be ghost-chords progression (see post 87 ).

For example let us assume that we improvise a melody that we ascend with such steps that would suggest chords at the odd steps of the diatonic scale (I, II, V) and the descend with steps that suggest the even chords (II, IV, VI). The change from odd to even and vice versa is done with intervals of 2nds, 7nths and 4ths. 

Usually the melody would give so fast changing chords that would be classified as ghost chords (see post 87 ). 

It is important of course to have here the simplest possible relation of the simplicial melodic themes with the chords , which is one note per chord or the melodic theme is the transition bridge between successive chords. 

One of the best methods to choose relation of the notes of the simplicial submelody (one note per chord) and the chord progression, is so  that the intervals between the notes are minimized (1 semitone) or maximized (interval of 5th or octave and inverses). For successive chords in the wheel of 4th both extremes are feasible. For chords that are  relatives, intervals of 4ths are possible, while for chords with roots one tone apart, intervals of 5th are also possible. For chords with roots one semitone apart, obviously the minimum 1 semitone is feasible.  Of course a meaningful (in respect to joy and sadness , anxiety and serenity) repetitive pattern must occur both in the simplicial melodic themes and in the chord progression.  

The notes of the simplicial melodic themes (one for each chord at its simplest version) need not justify the chord progression. The justification will be with other embellishment notes that make the full melody as contrasted to the simplicial sub-melody. The initial justification of the chord progression is the feelings that it creates parallel to the simplicial sub-melody. The chord progression magnifies the attention and feelings of parts of the simplicial sub-melody and shrinks the feelings and roles of other parts of it. Of course both flows that of the simplicial melodic themes and of the chords progression must be harmonically compatible. In other words each note of he simplicial sub-melody must be also a note of the underlying chord. 

As the wheel of 4ths is the basic tool to design chord progressions, so scales is the basic rule to design melodic vectors (simplicial melodic themes).


As we wrote in the post 40, the intervals of  5th/4ths have higher harmonic score than the intervals of 3rd which in their turn have higher harmonic score than the intervals of 2nd.

So many beautiful melodies have this distribution of  the percentage   of  intervals in them. In other words % of 5ths/4ths> % of 3rds>% % 2nds.



Some of the melodies of the music od Incas, Andes etc, but also of all over the world composers have this property.

We should notice also that although the diatonic 7-notes scale is closed to intervals of 2nd, 3rds and 5ths or 4ths (but not both) the standard pentatonic scale is  closed  to intervals by 5th and by 4ths .

We say that a scale is closed to  intervals by nth, if and only if starting from any note of it if we shift higher or lower by an interval by nth, we are again in a note of the scale.


Nevertheless , other proportions of  percentages of 5ths/4ths/8ths, of 3rds and of 2nd are known to give characteristic types of melodies among the different cultures.

Other observed profiles of percentages are


%2nds> %3rds+%4ths/5ths/8ths 
(e.g. the 2nds double more than the rest of the intervals, ratio 3:1 ) :
Oriental and Arabic Music,  GypsyJazz, and Jazz Stephan Grappelli soloing

%3rds+%4ths/5ths/8ths>% 2nds or %  2nds<=50%.:
(e.g. the 2nds less than half compared to the rest of the intervals,ratio 3:1 )
 Music of Incas, and countries of the Andes. Celtic music Ancient Egyptian  music

For independent from chord progression free improvised melodies a simple way to create melodies with number of 2nds intervals <=50% is to alternate intervals of 2nds with intervals of 3rds, 4ths, 5th,s and 6ths. 

We must remark here that there are melodies that either

a) No single chord is best for accompany it all 

b) or any chord can accompany it.
c) Too many chords fast changing (ghost chords) are appropriate to accompany it.
d)  A small number of chords but only very fast changing (ghost chords) are appropriate to accompany it.

1) Such melodies are e.g. fast sequential successive sounding by 2nds for 2 or 3 octaves
2) But very close to is also melodies with alternating 3rds or 6ths and 2nds in a diatonic scale

MELODIES WITH 100%  INTERVALS OF 2NDS
Such melodies give the feeling of coherence in the melodic moves.
We must notice that even if we use, say 100%, intervals of 2nds in a scale, we may still create harmony. E.g. in such an extreme case of melody, the harmony is created by persisting and passing  again and again from notes of an interval of the scale. E.g. if such an interval of successive notes of the scale is x(i), x(i+1), x(i+2) , or  x(i), x(i+1), x(i+2), x(i+3), x(i+4) , and the time spend on each of these notes is in the average equal, then the harmony and underlying chord that is created is the  x(i),  x(i+2),  x(i+4) because these are more than the   x(i+1),  x(i+3), and thus the melody spends more time in the chord x(i),  x(i+2),  x(i+4) among other chords for the time that is in the interval  x(i), x(i+1), x(i+2), x(i+3), x(i+4).  
SPENDING MORE TIME ON SPECIFIC NOTES:
Similarly if we take again the extreme and simplistic example of melodies with 100% intervals of 2nds, and we want for a time interval to have as harmony and underlying accompanying a chord  X=(y1,y2,y3), then its about sufficient to spent about equal time to all other notes except in one or more of these  notes y1,y2,y3, that we spent much more time (making theme temporary centers of the melody)  creating thus the effect of this underlying chord harmony. Of course if we did not have the restriction of 100% intervals by 2nds, another method would be instead of spending more time to the notes of the chord , spending almost no time at all to notes not to the chord.


On the other hand if %3rds+%4ths/5ths/8ths>=2*(% 2nds)  or  number of 2nds intervals <=33%  then essentially the melody is sequence of chords linked by intervals of 2nds.


The way to create melodies with at least 2/3 of the intervals to by the larger intervals of 3rds , 5ths/4ths or 8ths, is to apply harping in a chord say with 6 or 8 steps on notes, where it is added only one intermediate note in the chord (e.g. 7nh, 6th, 4th or 2nd) and so that the created intervals of 2nd are only 2 in the 6 or 8 intervals. Then we shift to a relative chord an interval of  3rd away or to a resolution transition which is a chord in an interval  5th or 4th away , or we even shift to a chord a 2nd away in which case we do not use any additional note, and we continue so.  So finally %3rds+%4ths/5ths/8ths>=2*(% 2nds) .

Or a way to create melodies with number of 2nds intervals <=33% is
alternate for every one interval of 2nds two intervals of 3rds, 4ths, 5th,s and 6ths. Which of course usually mean of course in a diatonic scale that we arpeggio on chords successively one after the other in any order. But as we have said for god chord progressions, it is better to arpeggio i minor or major successive chords on the wheel by 4ths and 3rds


A way to take short notes of such beautiful melodies is to write the chord progression, and then one note with small letters above or below the chord denoting which neighboring note (by interval of 2nd usually)  is the extension of the chord in the melody.

%4ths/5ths/8ths/6th>%3rds>% 2nds :
(e.g. the 2nds +3rds less than half compared to the rest of the intervals,ratio 3:1,  )
The way to create such melodies with at least 2/3 of the intervals to by the larger intervals of 5ths/4ths or 8ths, compared to 3rds ,  and 2nds is to apply the same technique as before, but when harping inside the chord we use the intervals of 4th and 5th and 8th of the  normal position and   2  inversions, instead of the 3rds in  the normal position! In this way in the fast soloing or harping on the notes of the the chord has more intervals of 4th, 5th and 8th than of 3rds!

Nevertheless the chord progression over which this technique produces fast melodies may contain very fast chord changes, and may not be identical with the actual chord progression that the instruments play as background to the melody. This is the concept of "ghost chords" in the melody as described in the post 87. E.g. The full ghost chord progression may be D G D G D A D. While the chords really played is only D. 


String instruments, that the melody is played mainly along a string (e.g. Greek Bouzouki, sazi etc) the scales that are favored for melodies improvisation are ones with many 2nds and in particular scales with many occurrences of semitone intervals of 2nds (oriental type)

Diatonic instruments like Irish whistles, and flutes, diatonic panflutes etc are best for melodic improvisations with melodies with many intervals of 2nds. Intervals of 2nds provide the feeling of pitch continuation in the melody (chromaticity) but not of harmony. 

The Zampona pan-flute and the melodic corridor arrangements of the notes of a diatonic scale (see post 94 ) are best for melodies with high harmonic profile that is  %  2nds<=50%. or 
%  2nds<=33%.


THE "CHORD-AND-TRANSITION MELODIC THEME"  METHOD OF UNACCOMPANIED MELODIC IMPROVISATION.

Studying some of the musical pieces of Bach for solo instruments (e.g. 

BWV 1013 - Partita in A Minor for Solo Flute  https://www.youtube.com/watch?v=Datoqxx-biw) we may inspired for the next method of unaccompanied improvised soloing:


The melody is like a man wandering-walking in a town, who spends much time at squares and garden of the town that his is exploring. The squares and garden  are the chords, played in the solo , preferably a single chord spanned in two octaves, At this time of the soloing the emphasis is on the harmony. But when continuing till the next "garden or square"   then the emphasis is on the melodic themes and their affine structure dynamics (see post 97 and 101). How much time is spend in "gardens" ( chords) or "street-walking" (transition melodic themes) is a matter of choice of the improviser. If the melody is unaccompanied, then at the same time the chord progressions is improvised in this way. 


We remind the reader what we wrote in post 82, about creating melodies by melodic micro-themes. The reason we repeat the discussion here is that although this method initially was devised to compose melodies when already a chord progression is given, some of its aspects  can apply also as a method to create chord-independent melodies without having in advance a chord progression, but creating the melody with sufficient hidden harmony in it. Here is what we wrote


Here we concentrate one only simple organization structure which the closest corresponded in the poetic language and lyrics is the word. So we introduce a concept of micro-melodic theme, called
MUSICAL WORD that we may agree to symbolize say by wIt consists of a very small number of beats higher than 2 e.g.  3 or 4, and we may symbolize it with 0,s and 1,s , which means that at this beat if no sound is heard it is zero, while if a sound is heard it is 1. E.g. (0101) or (011) etc Now we divide the word in its LONG PART , that symbolize by L(w) , and SHORT PART . that we symbolize by S(w) and so that in time duration, or beats it holds that L(w)/S(w)>=2 (e.g. L(w)/S(w)=3 etc).

PITCH OSCILLATIONS AND THE MELODIC MICRO-THEME
The musical-words or melodic micro-themes need not be by intervals of 2nds! They can be by intervals of 3rds and 5ths or 4ths! Actually as we shall see in the RULE OF OSCILLATION below its ends may be the required oscillation which most often is an interval of 5th or 4th. E.g.on of the most common such dancing pattern is the (1,1,1), where 2 of the 1's is the long part and 1 is the short part. It may start so  that these 3, 1's are the notes of the underlying chord a kind of harping) , but then it dances away so that only two of the 1's are eventually notes of the underlying chord. The number 3 here most often in dancing comes from the 3-like steps of the running horse. In this way by going up and down the diatonic scale,   this very rhythmic structure of the melodic micro-theme, by odd and even steps creates chords and diatonic harmony. Of course the chord changes may be fast , so actually we are talking about ghost-chords! (see post 87 about ghost chords ). 
When playing or improvising  such melodies, with the vibraphone (metallophone) , the 2 , 3 or 4  mallets, correspond to this oscillating melodic micro-theme.

Such melodic micro-themes when improvised rhythmically (especially within a diatonic scale) , with statistically higher percentage of intervals of 3rds (4ths, 5ths also) compared to intervals of 2nds , will create chord-independent melodies with good harmony in them! 


Such oscillating musical words may be ascending, descending or waving. Ascending as excitation may be small (intervals of 2nd) low middle (intervals of 3rds) or high middle (interval of 5th or 4th) or high (intervals of  8th or higher) Of course, as they are combined, they definitely create the effect of waving. BUT the waving is not the very standard by intervals by 2nds but a richer one, that involves many intervals of 3rds and even 5ths, and 8ths. The simplicial sub-melody of such melodies are movements mainly with intervals by 3rds and 5ths. There is also acceleration and deceleration as the melodic theme starts and ends.

E.g. we may descend with a chord say Am and its relative C (out of chords would be notes of G), and ascend with its chromatic-complementary thee G7 (out of chord notes would be those of Am or C ) etc. In other words, we ascend with even or odd notes and descend conversely. Here although we may utilize only 3 chords (Am, C, G) the alternating-changing may be fast covering practically all waving and melodies of the pentatonic or diatonic scale. The scale-completion of the melody (see post 86)  , may be at the next octave rather than in the same octave!
The rhythmic repetition 3 times then the 4th is different is more common than 2 times repeated then 2 times a different. The total range of waving say of the first 3 repetitions may be of size a 5th, while the 4th measure a range of size an 8th, or vice versa.

Let us also assume that the chord progression that underlines the melody is the X(1), X(2) ,...X(n).

As we wrote in previous posts, the melody consists by a progression of melodic themes, that are transformed, by the 4 main transformations or translationinversiondilation and rhythmic transformation. This is indeed happening in to the melodic micro-themes or melodic or musical words during the part of the melody that sounds during say the chord X(i) i=1,2...n, BUT we impose here a very important structure which is the key to the beautiful folk melodies, and makes them compatible with the chord progression that underlines, the melody. And this rule is a 


RULE1 OF TRANSIENT AND CHORD NOTES. Obligatory part: In simple words, each musical-word w , that has underlined chord X(i) has the notes of its long part L(w) , to be notes of the chord X(i), (which includes extended forms of X(i) like X(i)maj7 or X(i)7 or X(i)add9 or X(i)sus4 ) while , the notes of its short part S(w) to be transient and belonging to the notes of the neighboring chord that is X(i-1) or  X(i+1), (which includes extended forms of X(i+1) like X(i+1)maj7 or X(i+1)7 or X(i+1)add9 or or X(i+1)sus4) or and more rarely to the rest of the chords of the chord progression. And if so if it contains a note from a non-adjacent chord Y(j) of the progression, then usually somewhere in the progression there is a transition X(i)->Y(j) or Y(j)->X(i) . We keep the transient notes sound at most 1/3 of the time only and the notes of the chord at least 2/3 of the time, because of the rule of long and short parts of the musical word or micro-theme. No mentioning of any scale is necessary in this definition (as usually there are more than one) but only of the chord progression, which is compatible with our enhanced concept of modern harmony. Nevertheless the chord progression over which this technique produces fast melodies may contain very fast chord changes, and may not be identical with the actual chord progression that the instruments play as background to the melody. This is the concept of "ghost chords" in the melody as described in the post 87. E.g. The full ghost-chord progression may be D G D G D A D. While the chords really played is only D. 

RULE2 An alternative rule is that a musical-word w , that has underlined chord X(i) has the notes of its long part L(w) , to be notes of the chord X(i), (which includes extended forms of X(i) like X(i)maj7 or X(i)7 or X(i)add9 or X(i)sus4 ) while , the notes of its short part S(w) to be transient and is one only intermediate not between the notes of the  chord X(i) (usually a 2nd away from the notes of X(i) and preferably but not obligatory this additional note to be a note of the other chords of the progression, again preferably and if possible of the previous or next chord, rarely on  of other chords. And if so, if it contains a note from a non-adjacent chord Y(j) of the progression, then usually somewhere in the progression there is a transition X(i)->Y(j) or Y(j)->X(i) .In this way we keep the transient notes sound at most 1/3 of the time only and the notes of the chord at least 2/3 of the time, in addition to the rule of long and short parts of the musical word or micro-theme. Even if we did not have the structure of micro-themes as musical-words with long and short notes , and we are playing in a random way the three notes of the chord plus one transient, in equal time in the average, we are still in the harmony of this chord, because of the proportion 3:1. And this would still hold if we used 2 transient notes in which case we would have the time proportion 3:2.  But in addition to this rule if we want also the intervals of 3rds, 4ths, 5th and 8th to be more than 2/3 of all the intervals the way is to apply harping in a chord say with 6 or 8 steps on notes, where it is added only one intermediate note in the chord (e.g. 7nh, 6th, 4th or 2nd) and so that the created intervals of 2nd are only 2 in the 6 or 8 intervals. Then we shift to a relative chord an interval of  3rd away or to a resolution transition which is a chord in an interval  5th or 4th away , or we even shift to a chord a 2nd away in which case we do not use any additional note, and we continue so.  So finally %3rds+%4ths/5ths/8ths>=2*(% 2nds) . Again the chord progression over which this technique produces fast melodies may contain very fast chord changes, and may not be identical with the actual chord progression that the instruments play as background to the melody. This is the concept of "ghost chords" in the melody as described in the post 87. E.g. The full ghost chord progression may be D G D G D A D. While the chords really played is only D. 

THEREFORE EVERY CHORD PLAYS THE ROLE OF A MINI CENTRAL SUB-SCALE AROUND WHICH THE MELODY DANCES FOR A WHILE ALTHOUGH IT  IS STEPPING ON OTHER NOTES TOO BUT NOT FOR LONG, THAT ARE MAINLY THE NOTES OF THE NEXT CHORD-SUB-SCALE. 

RULE 3 OF OSCILLATION OR BALANCE
THE COURT-MELODY USUALLY  OSCILLATES INSIDE AN INTERVAL OF 5TH OR 8TH. AND IT MAY BE OF THE NOTES OF THE HARMONIC SIMPLICIAL SUBMELODY (oscillating link or bridge of chords) OR THE ROOR-DOMINANT OF THE CHORD, OR MIDDLE 3RD AND 6TH OR 7NTH OFTHE CHORD (internal bridge of a chord).

RULE 4 OF AFFINE STRUCTURE BALANCE
The melody if ir ascend then it descends and vice versa. The imblanace of thsi rather slight to indicate joy or sadness respectively. (For the Affine structure of a melody see post 97)

RULE 5 OF PITCH SCALE-COMPLENTESS
THE MELODY IS DESIRD TO USE AS EVENTUALLY MANY AS POSSIBLE OF ALL THE NOTES OF AN INTERVAL EITHER OF THE 12-TONES CHROMATI SCALE OR OF A 7 NOTES DIATONIC SCALE.


WE MAY CALL SUCH A CHATTY FAST MELODY THE CHORD-COURT MELODY OR SIMPLER THE CHATTY COURT MELODY OF THE CHORD PROGRESSION.
IT IS IMPORTANT TO REALIZE THAT THE COURT-CHATT MELODY MAY USE OSCILLATIONS BETWEEN THE NOTES OF THE HARMONIC SIMPLICIAL SUBMELODY THAT ARE MAILY INTERVALS OF 4TH, 5TH AND 8TH.  (SEE POST 9, 65, 72 )




GENERAL REMARKS ABOUT MELODY-CHORD CORRELATION 
0) When a melody is created without reference to any chord-progression (see e.g. post 82 about INDEPENDENT MELODIES ), then an statistical profile with high percentages of intervals of 5ths, 4ths, and 3rds compared to 2nds is sufficient to make it an beautiful harmonic melody. But if there is already a chord progression, and we improvise with a melody on it, 
1) then during the time interval that a chord is sounding, we may want to have notes of the melody that include at least one note of the chord and in overall the time that notes of the melody that belong to the chord ,sound, is longer that the total time that the rest of the notes not in the chord is sounding during the chord. This is a quite strong rule. 
2) A weaker rule is simply the requirement that the notes of the melody during the sounding of the chord, contain  notes of the sounding chord, and probably that compared to their neighboring notes, the notes in the melody of the chord, sound longer during the sounding of the underlying chord.
3) If we abolish even this rule then we have an independent melody parallel to an independent chord progression, which is entirely acceptable in Jazz. In an independent melody, from the chord progression, we feel the harmony of the chord progression, but we apply statistically to all , some or none of the previous rules to some or of the chords.


We enlarge below more and we give an example.

Friday, February 2, 2018

81. HOW TO DERIVE NEW SCALES FROM THE HARMONICS (OVERTONES) OF A SINGLE TONE. THE HARMONIC PENTATONIC, HARMONIC 7-TONE AND HARMONIC 8-TONE SCALES.

HOW TO DERIVE NEW SCALES FROM THE HARMONICS OF A SINGLE TONE. THE HARMONIC PENTATONIC, HARMONIC 7-TONE AND HARMONIC 8-TONE SCALES.

SUCH SCALES OCCUR IN THE OVERTONE FLUTES

The pentatonic scale is supposed to be obtained by the first 9 harmonics when reduced to the first octave with frequencies based on a fundamental,  given by the harmonic order (numerator) and power of 2 which is the reduction in the first octave

C, D, E, G, A, C'

1, 9/8 , 5/4 , 3/2 , 7/4. 



Similarly the 7-notes diatonic scale

C---1 harmonic
D---9
E---5
F---11
G---3
A---7
B---15
C---2

To derive the 7 notes of the diatonic scale in major mode requires more harmonics (of a single note) that one may imagine.


Thus the 7-notes  of the diatonic scale in major mode, require 27 harmonics. And the correspondence is the next. The notes are of course lowered to be within one octave, while the harmonics in many higher.

C---1 harmonic
D---9
E---5
F---11
G---3
A---27 (or 7) 
B---15
C---2

So a major scale like C-E-G, requires only the first 5 harmonics
While a minor scale e.g. C-Eb-G requires 19 harmonics as Eb is obtained as the 19th harmonic.

In the Pythagorean method, we derive the 7-notes diatonic scale, by repeating 7 times, the 3rd harmonic of the previous harmonic (thus 3^6=729 harmonics of the deepest tone which is the F here)

So the correspondence in harmonics would be, starting from F this time


F---1 harmonic
C---3 harmonic
D---3^3=27
E---3^5=243
G---3^2=9
A---3^4=81
B---3^6=729
F---2

If the base note is C then

C---1 harmonic
G---3 harmonic
A---3^3=27
B---3^5=243
D---3^2=9
E---3^4=81
F---3^6=729
C---2


With this Pythagorean method, therefore all frequencies of the scale are simple ratios with numerator powers of 3 and denominator powers 2. The harmonics by 3, 3^7=2187, are close for the first time to harmonics by 2, for 2^11=2048. So after 11+1=12 octaves by harmonics as powers of 2  (+1 because we started lower than C) and after 7 intervals by 5th (harmonics 3^7) the two harmonics differ by an amount very close to the discrimination threshold by the human ear, which is called the Pythagorean comma. More formally the  Pythagorean comma, denoted by pc can be defined as the difference pc= log(3/2)/log(2)-7/12=0.001629167..... and it is an irrational number.

Here an analytic table from (https://en.wikipedia.org/wiki/Pythagorean_tuning )


NoteCDEFGABC
Ratio119881644332271624312821
Step9898256243989898256243

In full the Pythagorean enharmonic scale is (from https://en.wikipedia.org/wiki/Enharmonic_scale )


The following Pythagorean scale is enharmonic:
NoteRatioDecimalCentsDifference
(cents)
C1:110
D256:2431.0535090.22523.460
C2187:20481.06787113.685
D9:81.125203.910
E32:271.18519294.13523.460
D19683:163841.20135317.595
E81:641.26563407.820
F4:31.33333498.045
G1024:7291.40466588.27023.460
F729:5121.42383611.730
G3:21.5701.955
A128:811.58025792.18023.460
G6561:40961.60181815.640
A27:161.6875905.865
B16:91.77778996.09023.460
A59049:327681.802031019.550
B243:1281.898441109.775
C′2:121200


Notice that all the ratios of the 7-notes of the enharmonic Pythagorean diatonic scale are quotients powers that have base 2 or 3

C = 1

D= (3^2)/(2^3)=9/8

E=(3^4)/(2^3)=81/64

F=(2^2)/3=4/3

G=3/2

A=(3^3)/(2^4)=27/16

B=(3^5)/(2^6)=243/128 

This approach is very relevant t the Chinese musical system where all ratios are quotients of powers with base 2 or 3 (thus derived from the 3rd and 2 harmonic and their harmonics)

The ancient Chinese musical system depends on very ancient mathematics used to determine sound frequencies. The easiest way to explain it is to work through a real example.
Suppose that somebody wanted to make a musical instrument that could play any song in the ancient Chinese system. Here are the instructions:
Make a wooden box 105 cm long and 60 cm wide. Put guides for the strings near each end of the box, and fix it so that these two guides are 99 cm apart. Multiply 99 cm by 2/3, which is 66 cm. Place a fret all the way across the box on the 66 cm line.
Multiply 66 cm by 4/3, which is 88 cm. Place a fret along the 88 cm line.
Multiply 88 cm by 2/3, which is 58.66...6 cm. Place a fret along this line.
Multiply 58.66...6 cm by 4/3, which is 78.22...2 cm. Place a fret along this line.
Multiply 78.22...2 cm by 2/3, which is 54.148148...148 cm. Place a fret along this line.
Multiply 54.148148...148 cm by 4/3, which is 69.531 cm. Place a fret along this line.
Multiply 69.531 cm by 2/3, which is 46.354 -- and which is too short, so double it to get 92.708 cm. Place a fret along this line.
Multiply 92.708 cm by 4/3...
Multiply the previous answer by 2/3...
Keep going until you have put down eleven frets.
Counting the frequency on the open string and the frequencies on the fretted strings, for each string there will be 12 defined frequencies.
Tune the bottom string to some basic frequency. Tune the next string to the frequency of the bottom string at the first fret. Tune the third string to the bottom string's second fret. Keep going until you have tuned all twelve strings.
When you pluck these strings at all the fretted and unfretted positions, you will get 144 frequencies. Some of them will be duplicates, but not as many as you might think because this system is not like the Equal tempered system now used for almost all Western music.
Out of each twelve frequencies on a single string, you can make many selections of either five frequencies (for the pentatonic scales) or seven frequencies (for the heptatonic scales).

Since the sequence of 5ths is say the F->C->G->D->A->E->B , it is interesting to define successively larger and larger scales that contain many intervals of 5th in this sequence.

1) One interval of 5th C-G
2) 3 notes C,F,G (it is not a  major chord!) Interval structure 5-2-5
3) 4 notes C, D, F, G Interval structure 2-3-2-5
4) 5 notes C,D, F, G, A  Interval structure 2-3-2-2-3 which is the inverse of the well known minor pentatonic scale.
5) 6 notes C, D, E, F, G, A Interval structure 2-2-1-2-2-3. This may be called the Pyrhagorean 6-notes harmonic scale 

6)The scale F1-C2-G2-D3-A3-E4-B4-F5  or short wheel of intervals of 5.  This scale as sequence of intervals of 5 is e.g. F1-C2-G2-D3-A3-E4-B4-F5 has a span of 4 octaves! From F1 to F5 while the last interval B4-F5 is a not of 7 semitones but of 6.

Similarly if we would use intervals of 4 in the reverse order it would be

7) The scale B1-E2-A2-D3-G3-C4-F4-B4 or short wheel of intervals of 4.  This scale as sequence of intervals of 4 is e.g. F1-C2-G2-D3-A3-E4-B4-F5 has a span of 3 octaves! From B1 to B4 while the last interval F4-B4 is a not of 5 semitones but of 6.


Going back to the order in which the simplest harmonics derive the 12-tone chromatic scale, we may put, the intervals, chords, and scales with the maximum number of simplest harmonics, in the next order

1) A SINGLE TONE C ( ALL SIMPLE HARMONICS )

2) AN INTERVAL OF OCTAVE  C(N)-C(N+1) 2ND HARMONIC)

3) POWER CHORD C-G-C (2ND 3RD HARMONIC)

4) MAJOR TRIAD CHORD C-E-G-C (WITHIN THE FIRST 5 HARMONICS)

5) MAJOR TRIAD SUSPENDED 2 OR ADDED 9TH Cadd9 or Csus2 or Em7#5=Em7+
(WITHIN THE FIRST 9 HARMONICS. HERE A COINCIDENCE OF THE NUMBER 9)
THEY CAN BE CONSIDERED ALSO AS A 4-NOTES HARMONIC SCALE C-D-E-G-C
interval structure 2-2-3-5, which is a very common overtones scale of the overtones flutes! 

6) THE HARMONIC PENTATONIC (AN UNNOTICED SO FAR PENTATONIC SCALE!)

C-D-E-F-G-C (SEMITONE STRUCTURE 2-2-1-2-5)
(WITHIN THE FIRST 11 HARMONICS) which is again sometimes  overtones scale of the overtones flutes!  This scale also is directly playable in the Ney-flute which  has hole spanning a 5th of scale rather than an 8th C-D-(Eb)-E-F-(F#)-G

Nevertheless by combining acoustics of open-open and open-closed pipe with the first 9 harmonics we may get the classical mode of the major pentatonic scale. See  this  post below about overtone flutes.

7) THE HARMONIC 6-TONES SCALE (not to be confused with the Pythagoream 6-notes harmonic scale above)

C-D-E-F-G-Ab-C  (SEMITONE STRUCTURE 2-2-1-2-1-4)
(WITHIN THE FIRST 13  HARMONICS).


8) THE MELODIC MINOR  7-TONES SCALE (Not to be confused with the harmonic minor or major scale!)

C-D-E-F-G-Ab-Bb-C  (SEMITONE STRUCTURE 2-2-1-2-1-2-2 NOTICE THAT IT IS SYMMETRIC RELATIVE TO THE CENTRAL TONE INTERVAL OF 2 SEMITONES ON F-G. THIS SCALE IS KNOWN ALSO AS HINDU SCALE )

(WITHIN THE FIRST 14 HARMONICS).

NOTICE THAT COMPARED TO THE DIATONIC 7-NOTES SCALE, IT IS DERIVED WITHIN THE FIRST 14 HARMONICS WHILE THE 7-NOTES DIATONIC IS DERIVED WITHIN THE FIRST 27 HARMONICS!

9) THE HARMONIC 8-TONES SCALE 

C-D-E-F-G-Ab-Bb-B-C  (SEMITONE STRUCTURE 2-2-1-2-1-2-1-1 )

(WITHIN THE FIRST 15 HARMONICS).

(NOTICE THAT BY ELIMINATING THE Bb, WE RESULT TO THE

7-NOTES  1ST BYZANTINE SCALE OR HARMONIC  MINOR SCALE

WITH AMAZING SOUND

C-D-E-F-G-Ab-B-C  (SEMITONE STRUCTURE 2-2-1-2-1-3-1 ) AGAIN WITHIN THE 15 HARMONICS!

10) THE HARMONIC 9-TONES SCALE 


C-Db-D-E-F-G-Ab-Bb-B-C  (SEMITONE STRUCTURE 1-1-2-1-2-1-2-1-1 )

(WITHIN THE FIRST 17 HARMONICS).

(NOTICE THAT BY ELIMINATING THE D, WE RESULT TO A

SECOND HARMONIC 8-NOTES HARMONIC SCALE

WITH AMAZING SOUND

C-Db-E-F-G-Ab-Bb-B-C  (SEMITONE STRUCTURE 1-3-1-2-1-2-1-1 ) AGAIN WITHIN THE 17 HARMONICS!

AND BY ELIMINATING THE Bb IN THIS SCALE WE GET THE REMARKABLE

C-Db-E-F-G-Ab-B-C  AGAIN WITHIN THE 17 HARMONICS,  WITH SEMITONE STRUCTURE 1-3-1-2-1-3-1  WHICH IS NOTHING ELSE THAN THE 2ND BYZANTINE SCALE OR HARMONIC DOUBLE MINOR OR HUNGARIAN MINOR OR GYPSY MINOR SCALE!



11) THE HARMONIC 10-TONES SCALE 

C-Db-D-Eb-E-F-G-Ab-Bb-B-C  (SEMITONE STRUCTURE 1-1-1-1-1-2-1-2-1-1 )

NOTICE THE BLUE-NOTE Eb-E, THAT ALLOWS BOTH C MAJOR AND C MINOR CHORD.

(WITHIN THE FIRST 19 HARMONICS).

12) THE DIATONIC 7-TONES SCALE 

C-D-E-F-G-A-B-C  (SEMITONE STRUCTURE 2-2-1-2-2-2-1 )


If on the other hand we have an overtone flute based on C4, by alternating open-close-open-close etc and blowing each time more we get the 9 notes sequence of notes spanned on 3 octaves (4th, 5th, 6th) and up to the first 5 harmonic-overtones  by the open-pen acoustics and first 4 harmonic-overtones of the open-closed acoustics, in total 1st 2nd 3rd, 4th, 5th, 7th, 9th harmonics 

C4(open 1st basic harmonic)-G4 a bit sharped(closed 3rd harmonic)-C5(open 2nd harmonic )-E5(closed 5th harmonic)-G5(open 3rd harmonic)-A5 a bit sharped(closed 7nth harmonic )-C6(open 4th harmonic )-D6 a bit sharped (closed 9th harmonic)-E6(open 5th harmonic)

with intervals structure in semitones 

7-5-4-3-2-3-2-2

Main Chords C major C6
               Aminor    etc

which when reduced to a single octave it is the 6-notes scale by overtones

C-D-E-G-A-C  with interval structure  2-2-3-2-3

which is nothing else than the standard (Mongolian)  mode of the (major C) pentatonic scale



(WITHIN THE FIRST 27 HARMONICS).

ALTHOUGH THE DIATONIC SCALE REQUIRES MANY HARMONICS TO BE DEFINED, IT CAN BE PROVED THAT IT HAS THE LARGEST NUMBER OF MAJOR AND MINOR TRIADS COMPARED TO THE OTHER SCALES.

NEVERTHELESS THE STANDARD PENTATONIC SCALE IS THE MAXIMAL SUB-SCALE OF THE DIATONIC WHICH IS CLOSED TO INTERVALS BY 5TH (7 SEMITONES) iN OTHER WORDS STARTING FROM A NOTE OF THE SCALE BY GOING UP OR DOWN A 5THS (7 SEMITONES) WE ARE AGAIN BACK TO A NOTE OF THE SCALE. THE DIATONIC IS NOT CLOSED. IT IS CLOSED ONLY IF WE TOLERATE EITHER AN INTERVAL OF  5TH OR OF  4TH



Here is how it is made willow flutes without holes, playing on scale of...harmonics

https://www.youtube.com/watch?v=eSrXDZdwihU


Friday, January 26, 2018

80. The pitch translation homomorphism between melodic themes and underlying chords.

The pitch translation homomorphism between melodic themes and underlying chords.

When the melody is composed from little pieces called melodic themes M1, M2, M3 etc and each one of them or a small number of them (e.g. M1, M2)  , have the same underlying chord C1, then we have a particular simple and interesting relation between the chords C1, C2 , C3 and the melodic themes (M1, M2), (M3, M4) ,...etc. This is not the case when the melodic themes start at one chord and end to the next, that we usually call in the book, as "external melodic Bridges" . We are in the case of "internal melodic Bridges". This relation is based on the pitch translations of the melodic themes and of the chords. Actually this is also a scheme of composition of melodies based on small melodic themes (see post 9), when the chord progression is given or pre-determined.

So let us say that the melodic themes (M1, M2), have underlying chord C1. Then as we have said there are only 3 possible chord-transition relations in a chord progression (see post 30 ): C2 will be either in resolution relation with C1 which means that the rood of C2 is a 4th lower or higher relative to the root of C1, or the root of C2 is an interval of  3rd  away from the root of C1 , or and interval  of 2nd away from the root of C1. Let us symbolize by tr4(), tr3(), tr2() , where tr() is from the word translation, of these three pitch shifts. Then we may also translate the melodic themes similarly
tr4(M1), tr4(M2), or tr3(M1), tr3(M2), or tr2(M1), tr2(M2), Then automatically the new translated melodic themes will have as appropriate underlying chord the C2. Actually in the case of intervals of 3rd or 5th, the melodic themes tr3(M1), tr3(M2)  or tr5(M1), tr5(M2) may as well as appropriate underlying chord the C1 again as the 3rd and 5th of the chord is a pitch translation that leads to a note again inside the chord. This is the reason we called this relation homomorphism and not isomorphic. In mathematics , and correspondence H is call homomorphism relative to some relations R, if the the objects H(x1), H(x2) are in relation R , if the objects x1, x2 are in relation R. Here H(M1)=C1 and H(tr(M2))=C2 and C2=trn(C1) that is are in distance of interval of n (=2,3,4 etc) if tr(M1) and M1 are in distance of interval of n. It may happen that H(x1)=H(x2). But if when x1 is different from x2 then always also H(x1) is different from H(x2) we say that H is an isomorphism. Here because it may happen that H(M1)=C1, and H(tr(M1))=C1 again the correspondence of melodic themes and chord is not 1-1, that is H is an homomorphism not an isomorphism in general. 
By continuing in this way translating in pitch the initial melodic themes M1, M2 according to the interval shifts of the roots of the chord progression an remaining inside a diatonic scale , we compose a melody (or simplicial sub-melody too, see post 9). Of course in order for the melody not to be too monotonous we may vary also the melodic themes from ascending to descending etc.

Other translations of the melodic themes can be during the same underlying chord, and are obviously of an interval of 3rd.

Now even when we are at external melodic bridges e.g. M1 which starts at underlying chord C1 and ends in underlying chord C2, even then this homomorphism is of use! The way to make it work is to take the range of the melodic theme (usually starting and ending note as simplicial submelody) equal as interval to the interval of the roots of the underlying chords C1, C2. 

Chord progressions that two successive chords  are always either 1) an interval of  4th , that is successive n the wheel of 4ths 2) Relative chords where major turns to minor and vice-versa, thus roots-distance  an interval of 3rd 3) Chromatic relation , in other words the roots differ by a semitone
are best chord progressions for parallel translations of melodic themes by intervals of octave, 4th-5th, 3rd and semitone. 

Here is a video of jazz improvisation which uses this idea. The chord progression id C, F, G, and the of pitch translations of the initial melodic themes are always intervals of 4th or 5th.  

https://www.youtube.com/watch?v=IzWEyHTu_Zc

Wednesday, December 27, 2017

79. THE MELODIC-HARMONIC 7 NOTES, 2 OCTAVES SCALE (WHEEL OF 3RDS). The 7 notes 3 and 4 octaves scales of 4ths and 5ths.


Before this post the reader must study the posts 40 (that classifies intervals), the classification of  2-string triads , and  38 (that classifies 3-string triads) and 35. 

This scale is also the Harmonic tuning of the guitar (see post 1) which is optimal when chord playing is mainly the traget and not soloing so much


OPTIMAL GUITAR TUNING FOR CHORDS PLAYING MAINLY

2.) An more optimal but unkown tuning for the 6-string guitar when chord-playing is the main target and not so much solo playing is and even better by alternating minor and major 3rds. In semitones for the 6 strings   4-3-4-3-4 or 3-4-3-4-3
E.g. Bb2- D3-F3-A3-C4-E4 or F2-A2-C3-E3-G3-B3 or A2-C3-E4-G4-B4-D4
THIS MAY BE CALLED THE HARMONIC TUNING OF THE GUITAR AS IT IS BASED ON THE HARMONIC 2-OCTAVES 7-NOTES SCALE (see also post 79)
The latter is the most natural open tuning. There the same shape for major and minor chords and only 3 of them and in only one or frets compared to the 6 in the standard tuning guitar. If we want also dominant and major 7nth chords we use again only 2 frets. The same with the aug chords Only the dim7 chords require 3 frets. Because  of the symmetry of the tuning among the strings, the relations of relative chords and also chords in the wheel of 4ths is immediate to grasp also geometrically. Of course when we say shape of chords as it is standard in jazz, we do not play all 6-strings but only 3 or 4 strings.
Within 3 frets exist all chords of the  8-notes scale with interval structure 2-2-1-2-2-1-1-1 which is an extension and variation of the melodic double minor 2-2-1-1-1-1-2-2 or (1-1-1)-(2-2)-(2-2-1)
But also all chords of diatonic scale!


All the next chords are superposition of 2-notes relatives chords of types major, minor, diminished, and augmented. 


Discussion of the defnition-creation  and roles of the 8 basic such chords (in root position)
433=majVdim=R7
434=majVmin=Rmaj7
343=minVmaj=Rm7=R'6, where R' the root of  a  relative chord
333=dimVdim=Rdim7
334=dimVmin=Rm6=R'm7b5 , called also half diminsihed where R' the root of  a  relative chord
444=augVaug=Raug
344=minVaug=Rminmaj7
443=augVmaj=Rmaj7#5 

4 of the above chords can be 4-notes chords of the diatonic scale e.g. the R7, Rmaj7, Rm7, Rm7b5. But the Rdim7, Raug, Rminmaj7, Rmaj7#5 cannot be 4-note chords of the diatonic scale. Nevertheless there exist in other scales as we shall see like Harmonic minor, and harmonic double minor Melodic minor (Hindu)and Melodic double minor (Arabic) and other oriental scales as in the scales of post 52.

Some of the above  chords appear as chords of the HARMONIC LONG 12 NOTES 7 OCTAVES SCALE  (see post 42, and 34)  Wheel of 3rds
(successive distance in semitones) (434343434343434343434343) 

Besides the long scale we may define the HARMONIC 2 OCTAVES , 7 NOTES SCALE of 7 notes that spans 2 octaves, and every 3 or 4 successive notes is a chord of the above types 

Here it is (STARTING FROM THE  C3)

etc -C3-E3-G3-B3-D4-F4-A4-C5- etc  (all steps intervals of 3rds)


As a structure of intervals over semitones it is the next sequence

-4-3-4-3-3-4-3-

And the sequence of 3-notes chords , by successive 3 notes in this scale is the chord progression

C->Em->G->Bdim->Dm->F->Am

while as sequence of 4-notes chords is the

Cmaj7->Em7->G7->Bm6->Dm7->Fmaj7->Am7 or 

Cmaj7->G6->G7->Bm7b5=Dm6->F6->Fmaj7->C6

THE MELODIC CORRIDOR 


Constructing therapeutic harps, or similar instruments (e. thump  pianos https://en.wikipedia.org/wiki/Mbira or hang and handpans ) or such keyboards with this scale, has the property that almost what ever we play sounds harmonic as 3 or 4 notes in sequence are well known cords, and overlapping such triads , are relative chords. In fact we may design such an harmonic diatonic  double row keyboard
 as follows 

  -D3-F3-A3-C3- E4-G4-B4-
-C4-E3-G3-B3-D4-F4-A4-C5- 


Similarly this can be a beautiful , practical and harmonic tuning for harmonicas.

The blue is blowing and the red is draw. Then with the key we may have the sharps too thus in total

-D3#-F3#-A3#-C3#- E4#-G4#-B4#-
 -D3-  F3- A3-   C3-  E4-  G4-   B4-
-C4-  E3-  G3-  B3  -D4  -F4-  A4-  C5- 
-C4#-E3#-G3#-B3#-D4#-F4#-A4#-C5#- 

OR 
-D3#-F3#-A3#-C3#- E4#-G4#-B4#-
 -D3-  F3- A3-   C3-  E4-  G4-   B4-
-C4#-E3#-G3#-B3#-D4#-F4#-A4#-C5#- 
-C4-  E3-  G3-  B3  -D4  -F4-  A4-  C5- 


This type of tuning can be applied also as setting to 4 strings  frets of  the fretboard of the artiphon the midi-controller, and give it sound of adouble diatonic harp or flute etc.

(for he artiphon see here https://artiphon.com/  )


THIS KIND OF KEYBOARD OR TUNING OF INSTRUMENTS (FLUTES, HARMONICA, ARTIPHON , KEYBOARD ETC)  ALLOWS FOR MELODIES IMPROVISATION IN A FAST  WAY EASILY WITHOUT COMPLICATED FINGERINGS OBSTRUCTIONS AS LONG AS THE MELODY IS A DIATONIC SCALE. IT IS A BIT BETTER THAN PIANO KEYBOARD AS IT FOLLOWS THE SHAPING OF CHORDS BY INTERVALS OF 3RDS. IT IS EVEN AEASIRT THAN SINGING OR WHISTLING FROM THE HARMONY POINT OF VIEW!


The melodic corridor can be also be spotted  on the fretboard of the standard tuning 6-string guitar. It will also define an unusual shape  of the diatonic scale with 2 only notes per string. More on that on the post 94.


Similar to this harmonic scale is the next , with interval pattern 

-4-3-4-4-3-3-3-




or C3-E3-G3-B3-D#4-F#4-A4-C5


And the sequence of 3-notes chords , by successive 3 notes in this scale is the chord progression


C->Em->Gaug->Baug->D#->F#dim->Adim

Which when projected within one octave it is the 

C3-D3#-E3-F3#-G3-A3-B3-C4

which in interval structure it is the

-3-1-2-1-2-2-1

which is nothing else than the Harmonic minor (here we consider a sequence of notes and circular permutation of them the same scale)     

The last remaining permutation of harmonic 2 octaves scale , is the


-4-4-4-3-3-3-3 - or  3-3-3-3-4-4-4- 

e.g. 

C3-E3-G3#-C4-D#4-F#4-A4-C5  or as interval structure within one octave


C3-D#3-E3-F#3-G#3-A3-C4   

3-1-2-2-1-3- 

which is a 6-notes scale which is very close the 7-notes scale

3-1-2-2-1-2-1 

 which is the  2nd Harmonic minor or  Kurdi or Kassigar (see post 72).

Similar to the above 7 notes 2 octaves scale by 3rds are the 7 notes scales by 4ths and 4-octaves scale by 5ths.

In other words the next 7 notes scales

(We may agree to start from the 2nd octave)

7-notes 3 octaves scale by 4ths:

B2-E3-A3-D4-G4-C5-F5-B5

7-notes 4 octaves scale by 5ths:

F2-C3-G3-D4-A4-E5-B5-F6

See also the symmetric scales post 95 and the hexagonal pattern (Terpstra, Keyboards) of harmonies and melodies of the diatomic scales in post 99. 

(This post has not been written completely yet)