Assertion: bass drum's head | /r/MadeOf | animal skin
Facets:
value: until the late 1950s
type: TEMPORAL
value: almost always
type: TEMPORAL
Source sentences:
text: Until the late 1950s, the head of a drum was almost always made of animal skin.
text: Although some drummers, particularly timpani players, preferred the sound of heads made with animal skins, plastic heads soon almost completely replaced traditional heads.