Dominant 7 chords can be substituted with the 7th chord a tritone distance away.
Works especially well for substituting the V in the ii V I progression (major or minor).
FROZEN - Basic with Context:
Context: Music Theory
FILE TAGS
art/music
Q: What type of chord can be substituted with the same chord a tritone away?
A: Dominant 7th
Q: What two notes are shared in a tritone substitution?
A: The 3rd and the 7th
Q: What is the purpose of a tritone substitution?
A: Provide a more interesting cadence to the I chord, borrowing notes from a different implied key.
Q: What progression is the result of using a tritone substitution on a ii7 - V7 - Imaj7 ?progression?
A: ii7 - flat II7 - Imaj7