Color pitch_carrier according to pitch-class.
abjad> t = Note(0, (1, 4)) abjad> pitchtools.color_by_pc(t) abjad> print t.format \once \override NoteHead #'color = #(x11-color 'red) c'4
pitchtools.chromaticize
pitchtools.diatonic_interval_to_absolute_interval
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