If there is an issue with your game and you need a replacement disc, you’ll need to contact the publisher to see what the warranty is and/or if you can purchase a reduced-cost replacement disc. The publishers are:
Electronic Arts for: Rock Band 1, Rock Band 2, Rock Band 3 pre-November 2011, Green Day Rock Band, The Beatles Rock Band, all Track Packs including AC/DC
Mad Catz: Rock Band 3 post November 2011
Warner Brothers Entertainment: Lego Rock Band
If you’re having a software issue that does not relate to warranty repairs/scratched discs/etc., you can ask for peer help in these forums or get help directly from Harmonix at our support portal.