Assertion: pop music's form | /r/HasProperty | developed in early 1970s
Facets:
value: by combining jazz improvisation
type: MANNER
Source sentences:
text: In the late 1960s and early 1970s, the hybrid form of jazz-rock fusion was developed by combining jazz improvisation with rock rhythms, electric instruments and the highly amplified stage sound of rock musicians such as Jimi Hendrix and Frank Zappa.