Piotr Zak is a fictional Polish composer who was the subject of a spoof BBC documentary, The Strange Case of Piotr Zak. The BBC broadcast a performance of his piece Mobile for Tape and Percussion on June 5, 1961. It won approving reviews from two leading music critics (although others condemned it as worthless and unmusical). Later it was revealed that the piece consisted of twelve minutes of BBC staff making noises at random, edited together by BBC technicians as a parody of avant-garde music.
The spoof was perpetrated by Hans Keller and Susan Bradshaw at the BBC.