Um... What?
Anyway, new info. There will be tons of songs from Sonic Games that different bands can play. First, you pick the band leader. Then, it shows a list of songs that leader is able to play. (The leader is usally the singer.) Next, you choose a song, and it gives you band members. So, let's say you chose Manic as your leader. It would show a couple songs from Sonic Underground (only good ones, mind you) and some others. You pick the song, "I've Found my Home". Then Sonic and Sonia come in onstage and play "I've Found my Home" with Manic singing (In some other Sonic Underground songs, all 3 of the siblings can be the leader). Also, there are different stages that you can unlock throughout the story mode. Such as Green Hill Zone, or Egg Factory, or even Acid Plant (the stage where the Sonic Underground originally played, "The Sound of Freedom").