Assertion: choir's music | /r/CapableOf | involve choir
Facets:
Source sentences:
text: Popular music in his day (1920s–1940s) could involve a choir, but opera and oratorio need a choir or chorus, if the full range of composition, arrangement and performance is to be allowed.
text: Popular music in his day (1920s–1940s) involve a choir, but opera and oratorio a choir or chorus, if the full range of composition, arrangement and performance is to be allowed.