Assertion: fifty rock | /r/CapableOf | become popular
Facets:
value: during the sixties
type: TEMPORAL
Source sentences:
text: While popular can change ( fifties Rock became popular during the sixties, later on it was Disco that was the most popular, then Rap, Techno etc... ), mainstream means the category of a certain type of music who went to popular to a kind of accepted music by all.