This week's additions to Rock Band's ever-growing track list are three Black Sabbath covers: "N.I.B.," "Sweet Leaf," and "War Pigs." Each track can be purchased individually for 160 Microsoft Points ($2), with the three-song bundle offering a slight savings at 440 Microsoft Points ($5.50).

Though not currently available to PlayStation 3 owners, the new tracks are expected to be available Thursday after the online PlayStation Store's weekly update. The PlayStation 2 version of Rock Band, due out December 18, does not support downloadable content as the system lacks the required storage capacity.

Songs slated to arrive within the next few weeks include tracks from The Clash, Ramones, Buzzcocks, Weezer, and Radiohead. For the full details, scope out the announced content schedule.