That's pretty awesome. Thanks!
If you need any help modding it for your particular needs, just PM me.
I haven't tested it out in Brawl yet, but I assume the Sonic Adventure 2 Hero Compilation is Sonic, Tails, and Knuckle's themes (It Doesn't Matter, Believe in Myself, and Unknown from M.E., respectively) compiled together. If that's true, do you think you could make a Dark Compilation with Shadow, Eggman, and Rouge's themes (Throw It All Away, E.G.G.M.A.N., and Fly in the Freedom, respectively) put together?
I just checked and I don't have any of those tracks. I have the Sonic Adventure 2 Multi-Dimensional soundtracks which just have level music.