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I know that I can play a b2 Dorian scale over a DomSus chord with a lowered ninth, but what about over a major7 b2?

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You probably won't encounter this chord very often, but you could derive a synthetic scale for it. A synthetic scale is made by altering a traditional scale to fit your purposes.

In this case, you could play a major b2 scale. For Cmaj7b2:

C Db E F G A B C

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b9 is not an appropriate chord for a maj7 because the b9 note confuses the root of the chord. In any case, the general rule of thumb is simple: when you alter a tone, you simply keep the original underlying scale, while making the adjustment for that single tone.

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I wouldn't say that it's never appropriate, but it's definitely not conventional. – charlieparker Oct 22 '13 at 21:33
@charlieparker Good clarification – Michael Martinez Oct 22 '13 at 22:01

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