The
chromatic scale is a
musical scale with twelve
pitches, each a
semitone above or below another. On a modern piano or other
equal-tempered instrument, all the semitones have the same size (100
cents). In other words, the notes of an equal-tempered chromatic scale are equally spaced. An equal-tempered chromatic scale is a
nondiatonic scale having no
tonic because of the
symmetry of its equally spaced notes.