Guitar Hero Tunes on iTunes
Guitar Hero Essentials comprises mostly the master track recordings featured in the games, but also includes some Guitar Hero exclusives, like the Sex Pistol's totally anti-corporate re-recording of "Anarchy in the U.K."
The Guitar Hero III: Legends of Rock soundtrack CD retails in stores today as well, and includes a code for acquiring three additional in-game tracks. Purchasers of the Guitar Hero III tracks on iTunes will be out of luck, but soundtrack buyers can redeem the pack-in code at Interscope's website and obtain an Xbox Live code for AFI's "Carcinogen Crush," Flyleaf's "Tina," and the Yeah Yeah Yeahs guitarist Nick Zinner's remix of Marilyn Manson's "Putting Holes in Happiness."
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I hope these are the real songs, not just the covers they put in some of the games.