New in version 2.0.
Iterate notes and chords in expr outside traditional instrument ranges:
abjad> staff = Staff("c'8 r8 <d fs>8 r8")
abjad> instrumenttools.Violin()(staff)
Violin()(Staff{4})
abjad> for note_or_chord in instrumenttools.iterate_notes_and_chords_in_expr_outside_traditional_instrument_ranges(staff):
... note_or_chord
Chord('<d fs>8')
Return generator.