New in version 2.0.
Get first voice in proper parentage of component:
abjad> voice = Voice("c'8 d'8 e'8 f'8")
abjad> staff = Staff([voice])
abjad> f(staff)
\new Staff {
\new Voice {
c'8
d'8
e'8
f'8
}
}
abjad> voicetools.get_first_voice_in_proper_parentage_of_component(staff.leaves[0])
Voice{4}
Return voice or none.