Here are the details straight from the release:
SANTA MONICA, Calif., Feb 23, 2009 /PRNewswire-FirstCall via COMTEX News Network/ -- Having united forces with rock 'n' roll legends Metallica for encore performances and recordings throughout the years, GRAMMY(R) Award-nominated heavy metal vocalist and Mercyful Fate frontman King Diamond will take to the cyber-stage with Metallica this spring in Activision Publishing Inc.'s Guitar Hero(R) Metallica(R).
Fans, stagehands and groupies alike will have the opportunity to shred and drum with or wail as the digital King Diamond during performances of "Evil." The song, which originally was recorded in 1983 and is one of the Mercyful Fate songs that comprise Metallica's "Mercyful Fate" medley, was re-recorded by four of the five original band members for Guitar Hero Metallica. The recording session was overseen by guitarist Hank Shermann in the band's native Denmark; after which King Diamond laid down his vocals in Dallas, Texas, and mixed the song with J.T. Longoria.
"It's been absolutely amazing to be a part of this Guitar Hero experience. It was quite a trip to re-record the song 'Evil' almost 25 years after the original recording took place. The end result with four out of the five original musicians turned out so much better than I would ever have hoped for," said King Diamond. "Seeing my animated character take form was totally eerie in a very good way. It's so strange to see yourself animated in such perfect detail - cross bone microphone, Eye necklace and all. This game looks and sounds METAL all the way. HORNS UP!!!"