Applause (musical) resulting musical could not contain any dialogue or characters that had been created for the movie but could use the original material that the movie also used. In April 1969, it was announced that Strouse, Adams, and book writer Sidney Michaels were beginning to work on the show, with Lawrence Kasha producing. In July 1969, movie star Lauren Bacall was cast as aging theater star Margo Channing, the role played by Bette Davis in "All About Eve". Bacall greatly identified with the role, explaining, "The Margo Channing of "Applause" and myself were ideally suited. She was approaching middle age. So
All About Eve for the aging diva role, before giving it to Bette Davis. Davis, who had recently ended an 18-year association with Warner Bros. after several poorly received films, immediately accepted the role after realizing it was one of the best she had ever read. Channing had originally been conceived as genteel and knowingly humorous, but with the casting of Davis, Mankiewicz revised the character to be more abrasive. Mankiewicz praised Davis both for her professionalism and for the caliber of her performance. Anne Baxter had spent a decade in supporting roles and had won the 1946 Academy Award for Best Supporting