Assertion: clarinet's key | /r/Causes | hammer
Facets:
value: as on a piano
type: LOCATION
value: mechanically
type: MANNER
Source sentences:
text: On other keyboard instruments, a key may be a lever which mechanically triggers a hammer to strike a group of strings, as on a piano, or an electric switch which energizes an audio oscillator as on an electronic organ or a synthesizer.