Chroma: Difference between revisions

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~~For~~ the ~~Fokker block concept~~ of chroma~~, see~~ [[~~Fokker block~~]].

{{About|chromas in general|the chroma in the diatonic scale|Chromatic semitone}}

__NOTOC__

The '''chroma''' (precisely the '''moschroma''') of a [[mos scale]] is the interval that is the difference between the large step and the small step in the scale. In particular, the chroma in the [[diatonic]] scale is the [[chromatic semitone]], or augmented unison, such as the interval of C–C♯.

~~The '''~~chroma~~''' of an~~ [[~~MOS scale~~]] ~~is the interval~~ that ~~is the difference between the large step and the small step in~~ the scale~~. For example~~, ~~in the diatonic scale the large step is the major second~~ (~~C-D~~) and ~~the small step is the minor second (C-Db). The difference between those two intervals is the augmented unison~~ (~~C-C#). The term was suggested as a way to generalize the concept of a sharp or flat (# or b~~).

In staff notation, alteration by the chroma can be represented by the sharp (♯) or flat (♭), as is shown above. In [[diamond-mos notation]], it should be noted that they are reserved exclusively for the diatonic scale, whereas am (&) and at (@) are used for other mos scales.

Moving one note in ~~an MOS~~ scale by a chroma leads to a [[~~MODMOS~~ scale]] (if the result is not just a transposition of the original ~~MOS~~ scale.)

Moving one note in a mos scale by a chroma leads to a [[modmos scale]] if the result is not just a transposition of the original mos scale.

The [[Fokker block]], being a generalization of the mos scale to higher ranks, also has the concept of chroma. See [[Fokker block]].

== History ==

The first mention of the term "chroma" occurs in Marchettus of Padua<ref>Marchettus of Padua (1318) ''Lucidarium''.</ref> where he describes it as an interval smaller than the diatonic semitone. The exact nature of the interval he was describing is debated.<ref>Joe Monzo (2008) ''Speculations on Marchetto of Padua's "Fifth-Tones"''. http://www.tonalsoft.com/monzo/marchetto/marchetto.aspx</ref>

== In psychoacoustics ==

In psychoacoustics, the term ''chroma'' refers to the circular perception of pitch with respect to [[octave equivalence]].

This is essentially the same as the concept of [[pitch class]].

== See also ==

* [[~~25/24~~]]~~, the classic chromatic~~ semitone

* [[Pythagorean chroma]]

* [[~~2187~~/~~2048~~]], the ~~Pythagorean~~ chromatic semitone

* [[Chromatic semitone]]

* [[25/24]], the 5-limit chromatic semitone

* [[Sharpness]], a property related to sharps and flats in [[edo]]s

* [[Diesis (scale theory)]]

== References ==

[[Category:Chroma| ]]

[[Category:MOS]]

[[Category:MOS scale]]

[[Category:MODMOS]]

~~{{todo|expand}}~~

[[Category:Terms]]

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-For the Fokker block concept of chroma, see [[Fokker block]].
+{{About|chromas in general|the chroma in the diatonic scale|Chromatic semitone}}
+__NOTOC__ <!-- No TOC because it's a rather short article. Remove this if it has expanded significantly. -->
+The '''chroma''' (precisely the '''moschroma''') of a [[mos scale]] is the interval that is the difference between the large step and the small step in the scale. In particular, the chroma in the [[diatonic]] scale is the [[chromatic semitone]], or augmented unison, such as the interval of C&ndash;C♯.
-The '''chroma''' of an [[MOS scale]] is the interval that is the difference between the large step and the small step in the scale. For example, in the diatonic scale the large step is the major second (C-D) and the small step is the minor second (C-Db). The difference between those two intervals is the augmented unison (C-C#). The term was suggested as a way to generalize the concept of a sharp or flat (# or b).
+In staff notation, alteration by the chroma can be represented by the sharp (♯) or flat (♭), as is shown above. In [[diamond-mos notation]], it should be noted that they are reserved exclusively for the diatonic scale, whereas am (&) and at (@) are used for other mos scales.
-Moving one note in an MOS scale by a chroma leads to a [[MODMOS scale]] (if the result is not just a transposition of the original MOS scale.)
+Moving one note in a mos scale by a chroma leads to a [[modmos scale]] if the result is not just a transposition of the original mos scale.
+The [[Fokker block]], being a generalization of the mos scale to higher ranks, also has the concept of chroma. See [[Fokker block]].
+== History ==
+The first mention of the term "chroma" occurs in Marchettus of Padua<ref>Marchettus of Padua (1318) ''Lucidarium''.</ref> where he describes it as an interval smaller than the diatonic semitone. The exact nature of the interval he was describing is debated.<ref>Joe Monzo (2008) ''Speculations on Marchetto of Padua's "Fifth-Tones"''. http://www.tonalsoft.com/monzo/marchetto/marchetto.aspx</ref>
+== In psychoacoustics ==
+{{wikipedia|Chroma feature}}
+In psychoacoustics, the term ''chroma'' refers to the circular perception of pitch with respect to [[octave equivalence]].
+This is essentially the same as the concept of [[pitch class]].
 == See also ==
-* [[25/24]], the classic chromatic semitone
+* [[Pythagorean chroma]]
-* [[2187/2048]], the Pythagorean chromatic semitone
+* [[Chromatic semitone]]
+* [[25/24]], the 5-limit chromatic semitone
 * [[Sharpness]], a property related to sharps and flats in [[edo]]s
+* [[Diesis (scale theory)]]
+== References ==
+<references/>
 [[Category:Chroma| ]] <!-- main article -->
-[[Category:MOS]]
+[[Category:MOS scale]]
 [[Category:MODMOS]]
-{{todo|expand}}
+[[Category:Terms]]