I thought he was quite good during his song performances. Am surprised he never released a CD Album.
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Come to Middle-Earth, a world beyond the furthest reaches of your imagination
From the IMDb F.A.Q. for Rock Star (2001)
The vocals performed by Wahlberg's character, Chris Cole, are provided primarily by Mike Matijevic (pronounced Mah-tee-ah-vich), singer for the band Steelheart. The songs sung by the character Bobby Beers are provided by Jeff Scott Soto, singer for Yngwie Malmsteen's band, among others.share
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He provided the vocals:
https://www.youtube.com/watch?v=F-nyeiKk35M
The beauty is I'm learning how to face my beast ~ Blue October