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
Bette Davis film, "Lady for a Day"), based on a story by Damon Runyon. She accepted her next role, in the Grand Guignol horror film "What Ever Happened to Baby Jane?" (1962), after reading the script and believing it could appeal to the same audience that had recently made Alfred Hitchcock's "Psycho" (1960) a success. She negotiated a deal that would pay her 10% of the worldwide gross profits in addition to her salary. The film became one of the year's biggest successes. Davis and Joan Crawford played two aging sisters, former actresses forced by circumstance to share a decaying Hollywood mansion.