# Twelve-Tone Equal-Tempered Scales

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Though people commonly talk about, for instance, *the* C major scale or *the* minor scale, in practice there are many ways to define a musical scale. A musical scale is essentially just a collection of frequencies that are assigned names such as , , F, and so on—these named frequencies comprise the notes or tones of the scale and the distances between any two frequencies make up the intervals of the scale. The octave is a particularly useful interval for tuning purposes and is defined as the interval between one note and another with double or half its frequency.

Contributed by: Rob Morris and Michael Schreiber (March 2011)

Open content licensed under CC BY-NC-SA

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