D Tritone Substitution
ii – bII7 – I progression in D major
D Tritone Substitution — ii – bII7 – I
The D ii–bII7–I tritone substitution (Em – D# – D) replaces the dominant V with a chord a tritone away, creating a chromatic, mysterious color. With seventh voicings (Em7 – D#7 – DMaj7), it delivers one of the most sophisticated sounds in jazz harmony.