There are five bands known as Zyklon B. A. Black Metal Project from Norway with members of Emperor, Satyricon and Dødheimsgard. Their only release was a Single with 3 tracks and 10 minutes playtime (later re-released with a bonus remixed track). Very fast, aggressive and atmospheric tracks about war, violence and depopulation of the earth. Members:
Samoth: Guitars (confusingly, also a member of the completely unrelated band, Zyklon);
Frost: Drums;
Draug Aldrahn: Vocals;


Read more about Zyklon-B on Last.fm.