Assertion: banjo | /r/CapableOf | form fundamental element
Facets:
value: in country music
type: LOCATION
value: by the late 1930s
type: TEMPORAL
Source sentences:
text: It was during the 1920s that the banjo formed a fundamental element in country music and, by the late 1930s, became identified with bluegrass, a sub-genre of country music with roots extending to traditional English, Irish, and Scottish music, while incorporating jazz to create upbeat tempos.