There are several bands called Asmodeus:
1) A czech Thrash Metal band formed in 1987.
Miloš Bešta - Vocals, guitar (1988-)
Tomáš Bešta - Guitar (1999-)
Milan Pózel - Bass (1999-)
Vladimír Hořký - Drums (1997-)
2) Asmodeus are a Psychobilly band too. Formed in Holland in 1992.
Arie - Vocals, bass
Dimitri - Guitar
Remco - Drums
3) Asmodeus are Black Metal band from Austria. Formed in 1996 by Tyr and Desdemon under the name of Diabolus. Read more on Last.fm