Dennis Potter’s The Singing Detective, directed by Jon Amiel and starring Michael Gambon as the Singing Detective. Well, not as the Singing Detective, because he is a fictional product of Philip Marlowe’s deluded brain. He is an author lying in a hospital bed suffering from arthritic psoriasis. His body is one big scab. His books come alive in his head and onscreen. Patients break into popular song and dance numbers and Michael Gambon as Philip...