Question: What subgenre of pop is Italian trio II Volo famous for?
Sentence (from "Operatic pop"): Popularized by American Vaudeville, musical comedies, jazz and operettas, examples include Irving Berlin's "That Opera Rag", Billy Murray's "My Cousin Caruso" and Louis Armstrong's riffs on "Rigoletto" and "Pagliacci".
Relevant evidence: No