The Tritone Substitution

A 3-lesson series on the Tritone Substitution.

A Tritone Substitution is the substitution of one Dominant 7th chord (possibly altered or extended) with another (possibly altered or extended) that is three whole-steps (a tritone) from the original chord. It's also known as a Flat-5 Substitution, since a tritone is a flatted 5th (technically speaking, a Diminished 5th) from the original root.