Assertion: rock | /r/CapableOf | evolve in united states
Facets:
value: during 1940
type: TEMPORAL
value: during early 1950
type: TEMPORAL
Source sentences:
text: Rock and roll (often written as rock & roll or rock 'n' roll) is the popular music genre that originated and evolved in United States during 1940's and early 1950, primarily from the combination of blues, country music, jazz and gospel music.