There are some changes that are common to all the systems, two of which I think are particularly important. The first is a "Party" mode. Here, you can change players in and out of the game without disturbing the rest of the band. You simply pause the player you want to change out and pass the instrument to the next player. You can also remove players or add players just as easily. The only downside to this mode is that you can't fail, so if you're one of those people who has to have a challenge, you probably won't play here as much. It really is perfect for parties though! The second feature that is important to me is the ability to import songs from Guitar Hero World Tour. This is a really cool thing as it keeps you from having to switch between versions just to play some of those songs that you wanted to play on the other one.