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Actually I'm curious, are we limited to one type of chord? For example, if I chose to do a Cadd9, could I use other notes, like the major seventh and what not as long as they fit in the context of C, or could I only use the notes in the Cadd9?
i would say if you do use them, use them only as though they were accidentals so that nobody has to worry about trying to detect a chord progression