Most of the albums available were included in past Collector's Editions of Blizzard games, such as the original soundtracks of World of Warcraft and The Burning Crusade, and even the Warcraft III: Reign of Chaos soundtrack. One of the coolest soundtracks, I think, is the Taverns of Azeroth collection by new age composer David Arkenstone. I've been a fan of Arkenstone since his days at Narada, and it was a very pleasant surprise for me to learn he was doing music for World of Warcraft. If you enjoy the music of the World of Warcraft -- and other Blizzard games, you might want to check out the iTunes music store. As a bonus, you can even download the Diablo III Overture by Russell Brower for free.