F Tritone Substitution
ii – bII7 – I progression in F major
F Tritone Substitution — ii – bII7 – I
The F ii–bII7–I tritone substitution (Gm – F# – F) replaces the dominant V with a chord a tritone away, creating a chromatic, mysterious color. With seventh voicings (Gm7 – F#7 – FMaj7), it delivers one of the most sophisticated sounds in jazz harmony.