Zyklon-B was a Norwegian black metal band founded in 1995. The band’s members were Tomas “Samoth” Thormodsæter Haugen (guitar and bass) and Vegard “Ihsahn” Sverre Tveitan (keyboard) from Emperor, Kjetil “Frost” Haraldstad (Drums) from Satyricon and Björn “Aldrahn” Dencker Gjerde (vocals) from Dødheimsgard. Their lyrics deal