3819 / 18210 · Workshop 20 — “I Got Rhythm” / Rhythm Changes: AABA Form, Fast Turnarounds, Dominant Chains, and Thinking One Phrase Ahead← prev⊞ allnext →
20.38Level 17 — tritone substitutions on the bridge
D7 can become:
A♭7.
G7 → D♭7.
C7 → G♭7.
F7 → B7.
This creates chromatic root approaches to the next destination.
But do not substitute all four yet.