Whats a chord substitution?
The changes represent the direct route for the journey through each chorus of a jazz performance. But as in any journey, there can be alternative routes and diversions that get you there just the same but take in new scenery on the way. These harmonic byways are signposted by chord substitutions. In some circumstances, knowing your substitutions is a badge of credibility for a jazz musician and there is even quite a lot of satisfaction to be gained by testing to the limit the degree to which one can wander away from mainline harmony and still retain musical coherence. The tritone substitution is one of the commonest you’ll hear mentioned. As the name suggests, the tritone is the name given to the interval between two notes three whole tones apart. So D and Ab are an example of a tritone relationship. Ab is three tones above (or below) D and D is three tones above (or below) Ab. Every note has its tritone partner. In many circumstances (particularly where the chords are from the dominan
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