There are several artists with this name 1. December were a hardcore metal band from Reno, Nevada.
Technical rifs, high pitched screams, & blast beats make up a sound that's far more like The Dillinger Escape Plan, Brutal Truth, Nostromo or The Power and the Glory 2. A japanese rock band consisting of three Members 3. December 디셈버 a Korean Duo, members Yoon Hyuk and Dae Gyu. 4. December is a Post Hardcore/Screamo band from Brazil. More info about the band: (http://www.myspace.com/rockdecember)

Read more about December on Last.fm.