212 MELODIC IMPROVISATIONS BY SHIFTING FROM 1) AEOLIAN MODE ( NATURAL MINOR) TO 2) DORIAN MODE 3) MELODIC MINOR 4) HARMONIC MINOR

 This improvisation and modulations of these 4 changes

1) Aeolian mode or natural minor a-b-c-d-e-f-g-a  (of D diatonic)

2) Dorian mode of  the diatonic scale of one tone higher thus here of D  diatonic
     a-b-c-d-e-f#-g-a
3) Melodic minor of C diatonic
   a-b-c-d-e-f#-g#-a

4) harmonic minor

   a-b-c-d-e-f-g#-a

ALL HAVE THE FIRST PART OF 5 NOTES OF PENTA-CHORD THE SAME AND STABLE

a-b-c-d-e or in  intervals in semitones   2-1-2-2

THEREFORE THE IMPROVISATION HAS ONLY CHANGES ON THE LAST 4 NOTES OR LAST TETEA-CHORD WHICH MAKES IT STABLE AND INTERESTING.
WHEN CHANGING THESE MODES AND SCALES WE MAY ALSO CHANGE OCTAVE TOO,WHICH IS VERY EASY IN AN OCTAVE TUNING AS IN POST 210.