If you elect to go the refund route, you have to put in a little leg work. Fill out this form (a PDF file), then stuff it in a box along with your guitar controller, guitar strap, and game in clam-shell package, then send it all to the address on the form via a shipper that provides a tracking number (Activision recommends UPS 3 day ground shipping). You'll then receive $132, which should cover both the cost of the game and the shipping charges. If however you decide you enjoy your game and would rather receive a replacement disc, go here. Got this from 1up.com
What's happening with it that would make all this necessary? N/M, I found out. Some audio glitch or something.
I remember hearing a while back that you had to ship back the game first to get the replacement disc, is that the case or do they have an advanced replacement option?