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The equal division of 16/9 (ed16/9) is a tuning obtained by dividing the Pythagorean minor seventh (16/9) in a certain number of equal steps. An ed16/9 can be generated by taking every other tone of an ed4/3, so even-numbered ed16/9's are integer ed4/3's.

Division of 16/9 into equal parts does not necessarily imply directly using this interval as an equivalence. The utility of 16/9 (or another seventh) as a base though, is apparent by being used at the base of so much modern tonal harmony.