9509 / 18210 · Workshop 78 — Upper-Structure Voice Leading in Motion: Keeping Rich Extensions Smooth Across Chords Instead of Treating Each Voicing as a Separate Shape← prev⊞ allnext →
78.43Level 23 — tritone substitution with identical shell
G7:
B-F.
D♭7:
C♭-F = B-F enharmonically.
Same shell.
Bass changes:
G→D♭.
So to move:
Dm7 → D♭7 → C,
you can preserve much of the RH.