Question: The Threepenny Opera (Die Dreigroschenoper ) is a "play with music" by Bertolt Brecht and Elisabeth Hauptmann, adapted from which of John Gay's English ballad opera in three acts, written in 1728?
Sentence (from "The Beggar's Opera"): The lyrics of the airs in the piece are set to popular broadsheet ballads, opera arias, church hymns and folk tunes of the time.
Relevant evidence: No