12.09  pitch class. That attribute of a tone which defines its position within the octave. Pitch classes are referred to by note names (C, C#, D, etc.).

Annotation 1          Tones of the same pitch class but that differ in pitch height are in some sense perceptually equivalent, and are given the same name, see 12.14 and Table 3.

Annotation 2          For example, {Cn : n is an integer} = {…, C-2, C-1, C0, C1, C2, C3 …} is the C pitch class.

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