There are multiple bands with this name: 1) Monsters is a 3 piece instrumental band from West Palm Beach, Florida.
http://www.myspace.com/monstersband 2) Created in 2008, Monsters was a 5 piece Deathcore band from Chicago, Illinois. They broke up in april 2011.
http://www.myspace.com/monsterswarfare 3) Chiptune/Dubstep/Experimental artist from Nite Owl Records

Read more about Monsters on Last.fm.