From Wikipedia, Rock Band Country Track Pack 2 contains 21 tracks, and was released for Xbox 360, PlayStation 3, and Wii on February 1, 2011. Unlike previously released Track Packs, the Country Track Pack 2 is based on the game engine of Rock Band 2, and all songs on the disc were exclusive to the Track Pack before being released as downloadable content on November 8, 2011. The retail disc export is compatible with Rock Band, Rock Band 2, and Rock Band 3 while the standalone DLC is only compatible with Rock Band 3. Source: Wikipedia, "List of Rock Band track packs", available under the CC-BY-SA License.