8670 / 18210 · Workshop 70 — From Lead Sheet to Full Solo-Piano Arrangement: Melody First, Bass Second, Inner Voices Third, Chord Symbols Last← prev⊞ allnext →
70.43Level 19 — substitution by bass requirement
Suppose bass wants:
D→D♭→C.
That suggests:
Dm7→D♭7→C.
Excellent.
The substitution serves the bass line.