Assertion: rock | /r/CapableOf | develop in united states
Facets:
value: throughout the mid-
type: TEMPORAL
value: to late 1960s
type: TEMPORAL
Source sentences:
text: Progressive rock (shortened as prog; sometimes called art rock, classical rock or symphonic rock) is a broad genre of rock music that developed in the United Kingdom and United States throughout the mid- to late 1960s.