Todd Phillips’s Joker made over $1 billion when it was released in 2019 and earned its formidable lead, Joaquin Phoenix, a best-actor Oscar. So, it was, of course, only a matter of time before we heard that the twisted psychological thriller centered on the green-haired super villain and Batman adversary would be getting a sequel. What is startling, however, is that the new project is a jukebox musical and Lady Gaga is taking on one of its starring roles.