# Ed12/5

The **equal division of 12/5** (**ed12/5**) is a tuning obtained by dividing the classic minor tenth (12/5) into a number of equal steps.

## Properties

Division of 12/5 into equal parts can be conceived of as to directly use this interval as an equivalence, or not. The question of equivalence has not even been posed yet. The utility of 12/5 (or another minor tenth) as a base though, is apparent by, beside being the base of so much common practice tonal harmony, and being the absolute widest range most generally used in popular songs. Many, though not all, of these scales have a perceptually important pseudo (false) octave, with various degrees of accuracy.

Incidentally, one way to treat 12/5 as an equivalence is the use of the 3:4:5 chord as the fundamental complete sonority in a very similar way to the 4:5:6 chord in meantone. Whereas in meantone it takes 4 3/2 to get to 5/4, here it takes 4 5/3 to get 4/3 (tempering out the comma 15625/15552 in the 12/5.3.4 fractional subgroup). This temperament is literally a "macro-meantone" as if you logarithmically stretch 2/1, 3/2, and 5/4 by 26%, you will get intervals very close to 12/5, 5/3, and 4/3 respectively. As a consequence, this temperament yields 5, 7, 12, 19, and 26 note MOS in exactly the same families as flattone, just with a period of 12/5 instead of 2/1.