labeling system

Human pitch-perception is periodic: pitches separated by an integral number of octaves are perceived as having a similar "quality" or "color. " Psychologists refer to the quality of a pitch as its "chroma. " Music theorists typically use the term "pitch class" rather than "chroma. "

There is a subtle difference between the concepts "chroma" and "pitch class. " A "chroma" is an attribute of pitches, just like whiteness is an attribute of white things. A "pitch class" is a set of all pitches sharing the same chroma, just like "the set of all white things" is the collection of all white objects. AMP NETCONNECT Labeling Software. Music theory's use of the term "pitch class" rather than "chroma" reflects the influence of logical positivism on its founders, particularly Milton Babbitt.

The pitch class "C" is an infinite set containing all pitches with the chroma C, no matter what octave they are in. Thus, using scientific pitch notation it is the infinite set

{Cn} = {. , C-2, C-1, C0, C1, C2, C3. }

Note that in standard Western equal temperament, distinct spellings can refer to the same sounding object: B♯3, C4, and D♭♭4 all refer to the same pitch, hence share the same chroma, and therefore belong to the same pitch class; a phenomenon called enharmonic equivalence.

To avoid the problem of enharmonic spellings, theorists typically represent pitch classes using numbers. Our comprehensive listing of manufacturers, distributors and service.

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