This isn't metal, and is sort of on the edge of rock, but it would provide for the most amazing Rock Band experience -- I am sure of that. The music is the most amazing, melodic, beautiful thing I have ever heard and this can all be attributed to how well the four artists compose their instruments (coincidentally the same instruments playable in Rock Band) together.
If you have not heard this music (and I hope I am speaking to some Harmonix staff when I say this. That is to say, I hope they are reading this thread) PLEASE at least go listen to some of their 30 second clips on iTunes! I honestly can't think of better music for Rock Band.









