G.I.S.M. (ギズム Gizumu) is a Japanese hardcore punk[1] band formed in Tokyo in 1981. Even though the guitar style resembled heavy metal in many aspects, GISM was one of the first Japanese hardcore bands, while at the same time drawing influence from the early industrial/avant-garde music scene—something uncommon in punk bands at that time. The acronym GISM has many different variations; they include: "Guerrilla Incendiary Sabotage Mutineer" (original)