Mayhem Records was a DIY label. It managed one single. 'What's My Line' by the memorably-named Mandible Rumpus. The catalogue number of the single was HEM-1; it came out in 1979 and has the appearance of a custom pressing. The music is reported to be 'A psychotic mix of Passage, Hazel O'Connor and King Crimson', which sounds intriguing. Distributed By Mayhem Records. Thanks to Robert Lyons For The Info.