A basic definition from Elementary Rudiments of Music by Barbara Wharram, a text recommended by the Royal Conservatory of Music of Toronto is:

A CHROMATIC scale (chromatic literally means "coloured") consists of all the twelve notes found between any note and its octave, all a semitone apart and all of equal importance.

The chromatic scale forms the basis of modern music. All other commonly used scales can be derived from the chromatic scale using a pattern of whole and half steps (tones and semi-tones. The chromatic scale consists of C-C#-D-D#-E-F-F#-G-G#-A-A#-B-C.

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