Our composer/level designer, M-Cue (http://m-cue.bandcamp.com/) came on this week's Harmonix Show and performed a live remix of the game's awesome soundtrack while we played. Super cool stuff.
https://www.youtube.com/watch?v=FBkTxXfA3qY
REMINDER: you can currently get the soundtrack bundled along with the Deluxe Edition of the game when you pre-order.
To catch future episodes of the the Harmonix Show as they air, follow our twitch channel at http://twitch.tv/harmonixmusic