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Encyclopedia of Microtonal Music Theory

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[Joe Monzo]

The ampersand-comma is a small 5-limit interval which functions as a unison-vector in many tunings. In particular, the ampersand-comma defines a promo which creates the 5-limit versions of miracle temperaments.

The size of the ampersand-comma may be described in the following ways:

2,3,5-monzo              ratio           ~ cents

[-25 7, 6 >      34171875 / 33554432    31.56728925

The ampersand-comma was named by tuning-theorist Paul Rapoport, after his cat Ampersand.

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