Assertion: progressive rock | /r/HasProperty | shortened as prog
Facets:
Source sentences:
text: Progressive rock (shortened as prog; sometimes called art rock, classical rock or symphonic rock) is a broad genre of rock music that developed in the United Kingdom and United States throughout the mid- to late 1960s.
text: Progressive rock (shortened to prog, or prog rock when differentiating from other “progressive…” genres) is an ambitious, eclectic, and often grandiose style of rock music which arose in the late 1960s, reached the peak of its popularity in the early 1970s, and continues as a musical form to this day.