All these women (1964)

Pretentious critic Cornelius is writing a biography on a famous cellist and to do some research he stays in the cellist's house for a few days. He doesn't manage to get an interview with the man, but by talking to all the women who live with him, he comes to learn a lot about the musician's private life none the less. Cornelius then decides to use this information to blackmail the cellist into performing a composition that he, Cornelius, has written.