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15 equal temperament
In music, 15 equal temperament, called 15-TET, 15-EDO, or 15-ET, is a tempered scale derived by dividing the octave into 15 equal steps (equal frequency ratios). Each step represents a frequency ratio of 21/15, or 80 cents (). Because 15 factors into 3 times 5, it can be seen as being made up of three scales of 5 equal divisions of the octave, each of which resembles the Slendro scale in Indonesian gamelan. 15 equal temperament is not a meantone system.
==History and use==
Guitars have been constructed for 15-ET tuning. The American musician Wendy Carlos used 15-ET as one of two scales in the track ''Afterlife'' from the album ''Tales of Heaven and Hell''.〔David J. Benson, ''Music: A Mathematical Offering'', Cambridge University Press, (2006), p. 385. ISBN 9780521853873.〕 Easley Blackwood, Jr. has written and recorded a suite for 15-ET guitar.〔Easley Blackwood, Jeffrey Kust, ''Easley Blackwood: Microtonal'', Cedille (1996) ASIN: B0000018Z8.〕 Blackwood believes that 15 equal temperament, "is likely to bring about a considerable enrichment of both classical and popular repertoire in a variety of styles".〔Skinner (2007), p.75.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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