F# Tritone Substitution
ii – bII7 – I progression in F# major
F# Tritone Substitution — ii – bII7 – I
The F# ii–bII7–I tritone substitution (G#m – G – F#) replaces the dominant V with a chord a tritone away, creating a chromatic, mysterious color. With seventh voicings (G#m7 – G7 – F#Maj7), it delivers one of the most sophisticated sounds in jazz harmony.