RedOctane's follow-up to the critically acclaimed rhythm game, Guitar Hero II, features a brand new and expanded track list, more venues and new play modes, and aims to rock longer and harder than its predecessor. For this sequel, RedOctane has once again teamed up with veteran music game developer Harmonix, and is using famed recording studio WaveGroup, who also recorded the covers for the licensed tracks in the original Guitar Hero, for its music production. The game's prestigious track list encompasses all forms of rock and metal music, including classic rock, heavy metal, modern rock and alternative rock. In total, Guitar Hero II features more than 55 songs. New modes include a multiplayer co-op mode where players can play not only the lead guitar track, but rhythm or bass as well, allowing players to take on two different sections of the song simultaneously.