Free GH3 DLC - Dropkick Murphys
It's just shy of 49mb and contains 3 songs: "Famous for Nothing," "(F)lannigan's Ball," and "Johnny, I Hardly Knew Ya," all master tracks.
To activate Star Power in these, you have to tilt your green beer mug all the way up!*
For full song credits, hit http://www.redoctane.com
*just kidding, no you don't. but it will give you a better score.