I once had a useful music software from Voyetra which could harmonically transpose a piece of music. However, after a crash I lost the software. Now I know how to transpose to another key, but I don't know if there's a method to harmonically transpose, ie transpose up or down but stay in the same key. I know this sounds lazy - and it probably is - but can someone say how to do it easily?
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Simply put: move all chord tones by the same number of steps through the diatonic notes.
Eg in the key of C
moving triads in step wise motion upwards gives:
C Dm Em F G Am Bmb5
moving 7th chords in step wise motion upwards gives:
CM7 Dm7 Em7 FM7 G7 Am7 Bm7b5.
a more detailed example (still in key of C):
moving Dm9 up one step:
Dm9 = D F A C E
move each chord tone to the next scale degree:
D becomes E, F > G, A > B, C > D, E > F.
This gives E G B D F which is an Em7b9