3302 / 18210 · Workshop 14 — “The Girl from Ipanema”: Major-Key Bossa, Chromatic Dominants, ♯11 Color, and Making a Simple Groove Sound Sophisticated← prev⊞ allnext →
14.47Guide tones of C7 versus G♭7
C7:
E-B♭.
G♭7:
B♭-F♭(E).
Same tritone.
That is why the substitution preserves dominant function.