It's definitely possible for live tracks to work, since each individual drum, guitar, vocal, bass, and piano part is recorded at the concert and mixed later. The only problem is if the mics record some of the noise that isn't intended to be recorded, so on the guitar track, for example, there could be crowd noises or bass, or one of the drum mics could accidentally pick up something from the cymbal. However, the individual tracks are there, and I'd bet that at least some of the songs from HAARP could work.
I can't believe how huge this thread is. Also, I would be all about Muse in Rockband and would surely buy any song available. I have their HAARP album in my car cd player now, and it rarely leaves.
MUSE MUSE MUSE!
+1 For A Muse Pack.
Any news on V-fest and the new album?