Biography
World of Warcraft was composed and arranged by Jason Hayes, Tracy W. Bush, Derek Duke and Glenn Stafford. It was released on November 23, 2004 together with the Collectors edition of the game. It is also sold separately on 1 CD, in the MP3 format.
Source:
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http://en.wikipedia.org/wiki/World_of_Warcraft#Soundtrack
Biography text from Last.fm, available under CC BY-SA.