"There is an online aspect to Rock Revolution as you are allowed to play with up to 3 people online, no vocals though as they are not included in the game.
The online mode is decent as you get to do a battle against another band of 3 people, but the fun does not last all that long.
Overall, Rock Revolution falters on many different levels and is clearly the weakest out of the 3 music games, far behind both Guitar Hero and Rock Band. Unfortunately, unless you are absolutely obsessed with rhythm music games, and love Konami, I have to recommend that you avoid this one. There is just too much competition out there to make Rock Revolution worth your time."