New in version 2.0.
Get note head from chord by pitch:
abjad> chord = Chord("<c'' d'' b''>4")
abjad> chordtools.get_note_head_from_chord_by_pitch(chord, 14)
NoteHead("d''")
Raise missing note head error when chord contains no note head with pitch equal to pitch.
Raise extra note head error when chord contains more than one note head with pitch equal to pitch.
Changed in version 2.0: renamed chordtools.get_note_head() to chordtools.get_note_head_from_chord_by_pitch().