AMM was a British free improvisation group that was founded in London, England, in 1965. The group was initially composed of Keith Rowe on guitar, Lou Gare on saxophone, and Eddie Prévost on drums. The three men shared an interest in exploring music beyond the boundaries of conventional jazz, as in free jazz and free improvisation. AMM never achieved widespread popularity, but have been influential in improvised music. Most of their albums have been released by Matchless Recordings, which is run by Eddie Prévost. In a 2001 interview, Keith Rowe was asked if "AMM" was an abbreviation. He replied, "The letters AMM stand for something, but as you probably know it's a secret!"

John Butcher is an English tenor and soprano saxophone player.