True when expr is an Abjad Pitch, Note, Notehead or Chord instance, otherwise False.
abjad> note = Note(0, (1, 4)) abjad> pitchtools.is_carrier(note) True
abjad> staff = Staff([ ]) abjad> pitchtools.is_carrier(staff) False
pitchtools.insert_transposed_pc_subruns
pitchtools.is_name
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