(Music Downloads Not Rated by the ESRB) Build your Rock Band library by purchasing this game song track pack, which includes: "N.I.B.," "Sweet Leaf," and "War Pigs," which are covers of songs made famous by Black Sabbath. PLEASE NOTE: this game song track includes three song game tracks at a discounted rate over individual purchases. Many Rock Band songs are available as both a multipack and as a single track. These songs are exactly the same (unless expressly noted as a special version or remix). Be aware that it is possible to download the same song twice so please carefully consider your purchases. For song credits, visit www.RockBand.com. There are no refunds for this item. For more information, see www.xbox.com/live/accounts. Compatible with Rock Band 3 and Rock Band Blitz.