The singing voice for Wahlberg's character was provided by Steelheart frontman Miljenko Matijevic for the Steel Dragon Songs, the final number was dubbed by Brian Vander Ark. Jeff Scott Soto (of Talisman, Yngwie Malmsteen, Soul SirkUS, and Journey) provided the voice of the singer Wahlberg's character replaces. Kennedy is the only actor whose actual voice is used. . Ralph Saenz (Steel Panther) also appears briefly, as the singer auditioning ahead of Chris at the studio.
Answer this question, making sure that the answer is supposed by the text: did mark wahlberg really sing in the movie rockstar?
no