The singing for the Wahlberg 's character was provided by an unknown vocalist , Erik Thomas for the Steel Dragon Songs .
The singing voice for Wahlberg 's character was provided by Steelheart frontman Miljenko Matijevic for the Steel Dragon Songs , the final number 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 .
Rock Star -LRB-2001 film-RRB-