There are (/have been) at least 3 bands called Gomorra: 1) Gomorra from Breda, The Netherlands, playing Thrash Metal. Formed around the beginning of 2010 and are still active today.
2) GomorrA from Hoppstädten, Germany, playing Melodic Death Metal.
Formed in 1990, released one demo and one full-length. They are now defunct.
3) Gomorra from Büdelsdorf, Germany, playing Death/Thrash Metal.
Disbanded after releasing one demo in 2005.

Read more about Gomorra on Last.fm.