C Tritone Substitution
ii – bII7 – I progression in C major
C Tritone Substitution — ii – bII7 – I
The C ii–bII7–I tritone substitution (Dm – C# – C) replaces the dominant V with a chord a tritone away, creating a chromatic, mysterious color. With seventh voicings (Dm7 – C#7 – CMaj7), it delivers one of the most sophisticated sounds in jazz harmony.