G Tritone Substitution
ii – bII7 – I progression in G major
G Tritone Substitution — ii – bII7 – I
The G ii–bII7–I tritone substitution (Am – G# – G) replaces the dominant V with a chord a tritone away, creating a chromatic, mysterious color. With seventh voicings (Am7 – G#7 – GMaj7), it delivers one of the most sophisticated sounds in jazz harmony.