This is the first Guitar Hero game that includes drums and vocals. This was added as a response to Rock Band (2007). Also, Guitar Hero: Smash Hits (2009) is the first to have a compilation of famous and infamous tracks from the previous entries. These songs in the game were updated so they could be played with a full band, and also, these are the master recordings, instead of covers that were in Guitar Hero (2005) and Guitar Hero II (2006).
You can do guitar duels with your match against Zack Wylde or Ted Nugent.