Assertion: oboe's key | /r/HasProperty | whisper/voice keys
Facets:
Source sentences:
text: However, in all varieties of oboe and bassoon, accidental keys, whisper/voice keys (which help to sound upper octaves) and lower-range extension keys differ greatly.
text: However, in all varieties of oboe and bassoon, accidental keys, whisper/voice keys (which help to sound upper octaves) and lower-range extension keys differ greatly.