Assertion: dub | /r/HasProperty | a subgenre of reggae
Facets:
value: commonly
type: TEMPORAL
Source sentences:
text: Dub is a subgenre of reggae which developed in the late 1960s and early 1970s.
text: Dub is a genre that grew out of reggae in the late 1960s, developed in the 1970's, and is commonly considered a subgenre of reggae, though it has developed to extend beyond the scope of reggae.