Assertion: rock's music | /r/CapableOf | originate as rock and roll
Facets:
value: in the united states
type: LOCATION
value: in the late 1940s
type: TEMPORAL
value: in early 1950s
type: TEMPORAL
Source sentences:
text: Rock music is a broad genre of popular music that originated as "rock and roll" in the United States in the late 1940s and early 1950s, and developed into a range of different styles in the mid-1960s and later, particularly in the United States and the United Kingdom.