Assertion: rock | /r/HasProperty | written as nroll
Facets:
value: often
type: TEMPORAL
Source sentences:
text: Rock and roll (often written as rock & roll or rock 'n' roll) is a genre of popular music that originated and evolved in the United States during the late 1940s and early 1950s, primarily from a combination of African American blues, country , jazz, and gospel music.
text: Rock and roll (often written as rock & roll or rock 'n' roll) is the popular music genre that originated and evolved in United States during 1940's and early 1950, primarily from the combination of blues, country music, jazz and gospel music.