To commemorate the 30th anniversary of Blizzard of Ozz and Diary of a Madman, Harmonix is releasing an eight-pack of Ozzy Osbourne songs to the Rock Band Music Store. The trick is, you only get a couple of those songs if you buy the entire pack.
Available separately are: "Diary of a Madman," "Flying High Again," "I Don't Know," "Mr. Crowley," "Over The Mountain" and "Steal Away (The Night)." Those are the usual couple bucks apiece.
But if you buy the entire Ozzy Osbourne 8-Pack for $13.49, you'll also get "Bark at the Moon" and "Mama, I'm Coming Home." Those two tracks are not available on their own.
In addition, "Bark at the Moon," "Mama, I'm Coming Home" and "Mr. Crowley" have the Pro Guitar and Pro Bass expansions available for an extra buck.