Assertion: pop music's form | /r/CapableOf | enter the golden age of cumbia
Facets:
value: during the 1950s
type: TEMPORAL
Source sentences:
text: Mambo, big band and porro brass band influences were combined by artists like Lucho Bermúdez to form a refined form of cumbia that soon entered the Golden Age of Cumbia during the 1950s.