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http://en.wikipedia.org/wiki/Tonality_diamond

 

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IN MUSIC THEORY AND TUNING, A TONALITY DIAMOND IS

A TWO-DIMENSIONAL DIAGRAM OF RATIOS IN WHICH ONE DIMENSION IS THE OTONALITY AND ONE THE UTONALITY.

THIS DIAMOND CONTAINS EIGHT IDENTITIES (1, 3, 5, 7, 9, 11, 13, 15).