Biography
Chances are, if you have any version of Guitar Hero as your artist name, it's tagged wrong. Check the game, the playlist online somewhere and reference the name properly.
If it's the new version of "The Devil Went Down To Georgis" from the battle vs Lou, then the artist is Steve Ouimette, as is "We Three Kings" as a Christmas period download.
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"Halo (Mjolnir Mix)" was re-done by Steve Vai.
Biography text from Last.fm, available under CC BY-SA.