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| The '''diesis''' (precisely the '''mosdiesis''') of a [[mos scale]] is the interval that is the difference between two enharmonic notes, i.e. the diminished mosstep or inverse diminished mosstep, whichever is positive. In [[soft]] (L:s < 2:1) scales, it is the diminished mosstep. In [[hard]] (L:s > 2:1) scales, it is the inverse diminished mosstep, since the diminished mosstep itself is negative. In basic (L:s = 2:1) scales, it [[vanish]]es.
| | #redirect [[Diesis #As a diatonic interval category]] |
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| The diesis or '''enharmonic diesis''' in the [[diatonic scale]] is the diminished second or inverse diminished second, whichever is positive. For example, the interval of C♯ – D♭. If the fifth represents the just interval [[3/2]], the diesis or inverse diesis represents the [[Pythagorean comma]]. In [[meantone]], it approximates a class of [[comma]]s separated by the [[81/80|syntonic comma]], among which [[128/125]], the augmented comma, is notable for being tuned pure in [[quarter-comma meantone]]. Therefore ''diesis'' traditionally refers to the augmented comma by default. Other dieses according to this definition are
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| * [[648/625]], the major diesis, tuned pure in [[1/3-comma meantone]].
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| * [[2048/2025]], the diaschisma, tuned pure in [[1/6-comma meantone]].
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| * [[32805/32768]], the schisma, tuned pure in 1/12-comma meantone.
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| == See also ==
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| * [[Diesis]] (disambiguation page)
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| [[Category:Terms]]
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| [[Category:MOS scale]]
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