The chromatic scale is the scale that contains all twelve pitches of the Western tempered scale.
All the other scales in traditional Western music are subsets of this scale. Each pitch is separated from its upper and lower neighbors by the interval of one half step, or semitone. In tonal and other music this scale finds little use outside of decorative runs up or down as it has no harmonic direction and is considered cliched. The term 'chromatic' is understood by musicians to refer to music which includes tones which are not members of the prevailing scale, and also as a word descriptive of those individually non-diatonic tones.
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