David Lynn Thomas is an American singer, songwriter and musician, now based in the UK. He was one of the founding members of the short-lived proto-punkers Rocket from the Tombs (1974–1975), in which he played under the moniker "Crocus Behemoth," and of post-punk group Pere Ubu. He has also released several solo albums. Though primarily a singer, he sometimes plays melodeon, trombone, musette, guitar or other instruments.

Pere Ubu is an American rock group formed in Cleveland, Ohio, in 1975. The band had a variety of long-term and recurring band members, with singer David Thomas being the only member staying throughout the band's lifetime. They released their debut album The Modern Dance in 1978 and followed with several more LPs before disbanding in 1982. Thomas reformed the group in 1987, continuing to record and tour.