John Gay parodied the opera with his satirical "Beggar's Opera" (1728) and with it delivered a satire of Robert Walpole's actions during the South Sea Bubble. Superficially, the play is about a man named Macheath who runs a gang for a criminal fence named Peachum, whose daughter, Polly Peachum, is in love with him, and who escapes prison over and over again because the daughter of the jailor, Lucy Lockitt, is also in love with him. Peachum wishes to see Macheath hanged because Polly has married Macheath, unlike Lucy Lockitt, who is merely pregnant by him (and neither woman is concerned with Macheath's sexual activity, but only with whom he marries, for marriage means access to his estate when he is eventually hanged). Peachum fears that Macheath will turn him in to the law, and he also feels that marriage is a betrayal of good breeding, that prostitution is the genteel thing. Gay announced his intention to create the "ballad opera" with the play. The music for the songs came from tunes already popular, and ten of the tunes were from the satirist Tom D'Urfey, whose "Pills to Purge Melancholy" was a collection of coarse, bawdy, and amusing songs on various topics. The ballad was associated with folk songs and folk poetry, and so Gay's choice of using ballads (although ballads written by a well-known author) for his music was itself an attempt to deflate the seeming pomposity and elitism of the opera.