There are at least two different artists with the name Colosseum: 1. A British progressive jazz-rock band formed in 1968. 2. A funeral doom metal band from Finland. They released three full-length albums before disbanding. 1. Colosseum is a British progressive rock / jazz-rock band formed in 1968 by drummer Jon Hiseman, tenor sax player Dick Heckstall-Smith and bass player Tony Reeves, who had previously worked together in John Mayall’s Bluesbreakers on the Bare Wires album.