There are 11 different bands known with this name.
1. Elysium (PL) is a melodic death/thrash metal band from Poland, Wroc³aw. The song "Snake Legion" turns up as the 7th track of off the 2008's "Death Metal Legends" Complication.
For more information, see Official Elysium website
2. Elysium (DK) is Kristian Thinning Andersen, a producer of Ethnic Tribal Goa trance from Denmark. Elysium has been around since 1994, relesing a variated amount of music on labels such as Nova Zembla Read more on Last.fm