There is more than one artist with this name, including: 1) Colosseum is a British progressive jazz-rock band formed in 1968. 2) Colosseum was a funeral doom metal band from Finland. 1. A British progressive jazz-rock band formed in 1968. 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. Read more on Last.fm