Assertion: pop music's popularity | /r/Causes | the appearance of the category
Facets:
Source sentences:
text: The popularity of "contemporary folk" recordings caused the appearance of the category "Folk" in the Grammy Awards of 1959: in 1970 the term was dropped in favor of "Best Ethnic or Traditional Recording (including Traditional Blues)", while 1987 brought a distinction between "Best Traditional Folk Recording" and "Best Contemporary Folk Recording".