Credit: Jon Furniss/

Image Credit: Jon Furniss/WireImage.comIron Man is putting on his top hat. Robert Downey Jr.’s spokesperson confirms to EW that the actor has signed on for an untitled Warner Bros. musical about a couple of Broadway songwriters who end up taking a job at theater camp when their breakthrough musical flops. The film’s music will be written by Brian Yorkey and Tom Kitt, the Pulitzer and Tony-winning team behind Broadway musical Next to Normal. Susan Downey, Downey’s wife, will produce.