B Tritone Substitution
ii – bII7 – I progression in B major
B Tritone Substitution — ii – bII7 – I
The B ii–bII7–I tritone substitution (C#m – C – B) replaces the dominant V with a chord a tritone away, creating a chromatic, mysterious color. With seventh voicings (C#m7 – C7 – BMaj7), it delivers one of the most sophisticated sounds in jazz harmony.