There are at least 4 artists with this name: 1) Skatepunk one-man band from Chile (current artist image).
2) Metal band from the USA.
3) Dutch Power Electronics, side project of Terg and Cultus.
4) Hardcore band from Helsinki, Finland 1) Formerly a regular 4-piece skatepunk band born in Chile back in 2004, Bitter has become the solo project of Ricardo Araya since late 2008. Playing all the instruments but drums, he has managed to stay melodic and technical, now with the help of Impacted Records (USA). http://www.myspace.com/bitterskatepunk

Read more about Bitter on Last.fm.