Whistler's Father  "Whistler's Father" is the third episode of the twenty-ninth season of the animated television series "The Simpsons", and the 621st episode of the series overall. It aired in the United States on Fox on October 15, 2017. This is the final episode with a credit to longtime "Simpsons" score composer Alf Clausen, who was fired from his position shortly before the season began airing. Marge is out for the evening with Luann Van Houten, Bernice Hibbert and Helen Lovejoy, and asks Homer to take care of Maggie. The women, led by Helen, criticize Marge's taste in interior decorating. Meanwhile, Homer discovers Maggie has a talent of being a whistling savant. Homer starts dreaming of using her talent to become famous. Meanwhile, Marge thinks about her tastes, and resolves to decorate a late-pick-up room for Springfield Elementary like the set from The Wizard of Oz, but Lisa remembers there never was one. The Hibbert family changes their opinion on Marge's style, but Helen is not convinced yet while Fat Tony appears with his cousin's son Michael D'Amico, offering her a decorating job. At Moe's Tavern, Homer tried fooling the guys, but Grampa Simpson unveils his trick, telling the story of his whistling talent being stopped by a performance going wrong, and asks Homer to bring her to become as popular as he once was. They bring Maggie to the Springfield City Zoo to teach her new whistles, and Bart Simpson is disappointed he's the only son not to have talent, while vultures try to take Grampa, unsuccessfully. At the Springfield Post Office, Fat Tony asks Marge to redecorate it. At the Get It and Regret It Hardware store, a family tries a couch, imitating the family's couch gags, and Squeaky Voice Teen tells them they have to buy it after trying the couch, while Marge buys stuff to redecorate the post office, but she discovers that Fat Tony turned it into a whorehouse. The family, reunited to eat, is hiding secrets from each other, including Santa's Little Helper and Snowball II kissing each other. Homer brings Maggie to Channel 6, where the Hot Shot Tots Springfield Audition is held, and finds out how show business works and tries to convince Maggie to stop but she refuses, while the women discover what happened to the post office. Marge convinces Fat Tony to close the whorehouse down while Maggie, in front of the public, can't whistle anymore due to a tooth growing in her mouth.