How do you use tritone substitutions?
The tritone substitution can be performed by exchanging a dominant seventh chord for another dominant seven chord which is a tritone away from it. For example, in the key of C major one can use D♭7 instead of G7. (D♭ is a tritone away from G).
What is a tritone substitution in jazz?
A tritone substitution occurs whenever a chord is being substituted or replaced by another chord with a root a tritone interval away. Example: G7 is replaced by Db7. In this episode I give example of three different way to apply tritone substitution and I give some lick examples of how you could improvise over them.