Assertion: pop music's popularity | /r/HasProperty | testimony
Facets:
value: to vitality
type: OTHER
value: through very different historical periods
type: TEMPORAL
Source sentences:
text: The continuing popularity of roots music throughout the course of the 20th and into the 21st centuries is testimony to its appeal and vitality as a set of musical genres that speak to - and of - the human condition, through very different historical periods.