Harmonics 21–42: Difference between revisions

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{{Infobox AFDO|steps=21}}
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'''21afdo''' ([[AFDO|arithmetic frequency division of the octave]]), or '''21odo''' ([[otonal division]] of the octave), divides the octave into 21 parts of 1/21 each. It is a superset of [[20afdo]] and a subset of [[22afdo]]. As a scale it may be known as [[Harmonic mode|mode 21 of the harmonic series]] or the [[Overtone scale #Over-n scales|Over-21]] scale.
{{Harmonics intro|21}}

Latest revision as of 00:25, 11 October 2026

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Harmonics 21–42
Prime factorization 3 × 7
Dual sharp fifth 32/21 (729.219c)
Dual flat fifth 31/21 (674.255c)

The harmonic segment 21::42 (also harmonics 21–42) consists of harmonics 21 through 42 (21:22:…:42) and spans one octave above the root. Used as a scale, it is also called mode 21 of the harmonic series.

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