A tetra-chord (ana ncient greek word meaning 4-strings) is simple a 4-notes scale.
A tetrachord defined by a major or minor chord is simply 4 notes that include the 3 notes of a minor or major chord and also a 4th one (thus an 4 notes extension of the chord with 2nd or 4th).
The next are the 9 4-chords defined by major or minor chords
Diatonic gendre (part also ofthe stanrd pentatonic scale)
major: (2-2)-3 (major with 2nd)
minor: 3-(2-2) , (minor with 4th)
Enharmonic gendre
major 4-(1-2) , (major with 4th)
major 4-(2-1) , (major with 4th)
minor (2-1)-4 ,(minor with 2nd)
minor (1-2)-4 ,(minor with 2nd)
Chromatic gendre
major/minor (3-1)-3 , (major with 2nd or minor with 4th)
major (1-3)-3 , (major with 2nd)
minor 3-(3-1) , (minor with 4th)
When we improvise we just put consecutivlly a repetitive combination of the previous 10 patterns
in which ever combination and permutation our feelings indicate.
If we are are set to be inside a single diatonic scale, then we just take care to spend more time in the even or odd order of notes and less in the intermediate and imediatly the melody has a nice underlying structure of chords. We may switch this long/short order from even to odd order of notes and vice versa as the feelings require.
Each 4-chord can be played with our 4 fingers of the left hand.
Such an improvisation defines also the chord progression that accompanies it. And as the chords have the 3 basic relations of Chromatic, Melodic , Harmonic, so also these tetrachords cab be in the chromatic , melodic, harmonic relation
If we utilize two or three consecutive in time such tetrachords we may define melodic themes that are accompanied with 2 or 3 chords as in post 313 E.g. for 2-hords such melodic themes the net notes will be at most 8.
A tetrachord defined by a major or minor chord is simply 4 notes that include the 3 notes of a minor or major chord and also a 4th one (thus an 4 notes extension of the chord with 2nd or 4th).
The next are the 9 4-chords defined by major or minor chords
Diatonic gendre (part also ofthe stanrd pentatonic scale)
major: (2-2)-3 (major with 2nd)
minor: 3-(2-2) , (minor with 4th)
Enharmonic gendre
major 4-(1-2) , (major with 4th)
major 4-(2-1) , (major with 4th)
minor (2-1)-4 ,(minor with 2nd)
minor (1-2)-4 ,(minor with 2nd)
Chromatic gendre
major/minor (3-1)-3 , (major with 2nd or minor with 4th)
major (1-3)-3 , (major with 2nd)
minor 3-(3-1) , (minor with 4th)
When we improvise we just put consecutivlly a repetitive combination of the previous 10 patterns
in which ever combination and permutation our feelings indicate.
If we are are set to be inside a single diatonic scale, then we just take care to spend more time in the even or odd order of notes and less in the intermediate and imediatly the melody has a nice underlying structure of chords. We may switch this long/short order from even to odd order of notes and vice versa as the feelings require.
Each 4-chord can be played with our 4 fingers of the left hand.
Such an improvisation defines also the chord progression that accompanies it. And as the chords have the 3 basic relations of Chromatic, Melodic , Harmonic, so also these tetrachords cab be in the chromatic , melodic, harmonic relation
If we utilize two or three consecutive in time such tetrachords we may define melodic themes that are accompanied with 2 or 3 chords as in post 313 E.g. for 2-hords such melodic themes the net notes will be at most 8.
