Diesis (scale theory): Difference between revisions
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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 the negative diminished mosstep, whichever is positive. In [[soft]] scales, it is the diminished mosstep. In [[hard]] scales, it is the negative diminished mosstep, since the diminished mosstep itself is negative. In | 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 the negative 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 negative diminished mosstep, since the diminished mosstep itself is negative. In basic (L:s = 2:1) scales, it [[vanish]]es. | ||
If the fifth approximates the just interval [[3/2]], then the diesis or the negative diesis approximates the [[Pythagorean comma]]. In [[meantone]], the diesis also approximates [[128/125]], the augmented comma, which traditionally goes by the name of diesis. | In particular, the diesis or '''enharmonic diesis''' in the [[diatonic scale]] is the diminished second or the negative diminished second, whichever is positive. For example, the interval of C#-Db or Db-C#. | ||
If the fifth approximates the just interval [[3/2]], then the diesis or the negative diesis approximates the [[Pythagorean comma]]. In [[meantone]], the diesis also approximates [[128/125]], the augmented comma, which traditionally goes by the name of ''diesis''. | |||
== See also == | == See also == | ||
Revision as of 13:24, 26 November 2023
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 the negative 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 negative diminished mosstep, since the diminished mosstep itself is negative. In basic (L:s = 2:1) scales, it vanishes.
In particular, the diesis or enharmonic diesis in the diatonic scale is the diminished second or the negative diminished second, whichever is positive. For example, the interval of C#-Db or Db-C#.
If the fifth approximates the just interval 3/2, then the diesis or the negative diesis approximates the Pythagorean comma. In meantone, the diesis also approximates 128/125, the augmented comma, which traditionally goes by the name of diesis.
See also
- Diesis (disambiguation page)