G# Tritone Substitution
ii – bII7 – I progression in G# major
G# Tritone Substitution — ii – bII7 – I
The G# ii–bII7–I tritone substitution (A#m – A – G#) replaces the dominant V with a chord a tritone away, creating a chromatic, mysterious color. With seventh voicings (A#m7 – A7 – G#Maj7), it delivers one of the most sophisticated sounds in jazz harmony.