Question: Who sings the steel dragon songs in rockstar?

Disambiguated questions and answers:
context: Internal struggles among the actual Steel Dragon band members culminate with the firing of their lead singer, Bobby Beers (Jason Flemyng), and the beginning of recruitment sessions to find a new vocalist. Chris experiences his own strife with his Blood Pollution bandmates, particularly guitarist Rob Malcolm (Timothy Olyphant). During a live performance, Rob's playing fails to live up to Chris' over-demanding standards regarding note-for-note accuracy to the original Steel Dragon recordings, and Chris sabotages Rob's amplifier mid-song – a fight breaks out between the two onstage. The next day, Chris meets Blood Pollution at a rehearsal session, but he finds out that he has been replaced with his arch-rival, the (now former) lead singer of another Steel Dragon tribute band. Rob also cites Chris' inability to create his own musical style, preferring to remain the singer in a tribute band.
question: Which character sings the steel dragon songs as a member of Steel Dragon in rockstar?
short_answers: Bobby Beers
wikipage: Rock Star (2001 film)
context: Internal struggles among the actual Steel Dragon band members culminate with the firing of their lead singer, Bobby Beers (Jason Flemyng), and the beginning of recruitment sessions to find a new vocalist. Chris experiences his own strife with his Blood Pollution bandmates, particularly guitarist Rob Malcolm (Timothy Olyphant). During a live performance, Rob's playing fails to live up to Chris' over-demanding standards regarding note-for-note accuracy to the original Steel Dragon recordings, and Chris sabotages Rob's amplifier mid-song – a fight breaks out between the two onstage. The next day, Chris meets Blood Pollution at a rehearsal session, but he finds out that he has been replaced with his arch-rival, the (now former) lead singer of another Steel Dragon tribute band. Rob also cites Chris' inability to create his own musical style, preferring to remain the singer in a tribute band.
question: Which actor sings the steel dragon songs as a member of Steel Dragon in rockstar?
short_answers: Jason Iain Flemyng
Jason Flemyng
wikipage: Rock Star (2001 film)
context: In the mid-1980s, Pittsburgh resident Chris Cole (Mark Wahlberg) is a fanatical admirer of a heavy metal band called Steel Dragon. By day, Chris is a photocopier technician and by night, he is the lead singer of a Steel Dragon tribute band called Blood Pollution (the name is taken from a Steel Dragon song).
question: Which character sings the steel dragon songs as a member of Blood Pollution in rockstar?
short_answers: Chris Cole
Chris "Izzy" Cole
wikipage: Rock Star (2001 film)
context: In the mid-1980s, Pittsburgh resident Chris Cole (Mark Wahlberg) is a fanatical admirer of a heavy metal band called Steel Dragon. By day, Chris is a photocopier technician and by night, he is the lead singer of a Steel Dragon tribute band called Blood Pollution (the name is taken from a Steel Dragon song).
question: Which actor gets filmed singing the steel dragon songs as a member of Blood Pollution in rockstar?
short_answers: Mark Wahlberg
Mark Robert Michael Wahlberg
wikipage: Rock Star (2001 film)
context: The singing voice for Wahlberg's character was provided by Steelheart frontman Miljenko Matijevic for the Steel Dragon Songs, and 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.
question: Which actor provides the singing voice for the steel dragon songs as a member of Blood Pollution in rockstar?
short_answers: Miljenko Matijevic
wikipage: Rock Star (2001 film)

Long-form answers:
knowledge: content: Rock Star is a 2001 American musical comedy-drama film directed by Stephen Herek from a script by John Stockwell and starring Mark Wahlberg and Jennifer Aniston.
wikipage: Rock Star (2001 film)
content: One day, Chris receives an unexpected phone call from Steel Dragon's founder and rhythm guitarist, Kirk Cuddy (Dominic West), and is offered an audition for the band (thanks to two of Blood Pollution's groupies, who showed Kirk a videotape of one of Blood Pollution's concerts).
wikipage: Rock Star (2001 film)
long_answer: Rock Star is a 2001 American musical comedy-drama film that features a fictitious heavy metal band called Steel Dragon. In the movie, internal struggles among the Steel Dragon band members culminate with the firing of their lead singer, Bobby Beers, played by Jason Flemyng, and the beginning of recruitment sessions to find a new vocalist. Chris Cole, played by Mark Wahlberg, is the lead singer of a Steel Dragon tribute band called Blood Pollution who gets the opportunity to audition for Steel Dragon. The singing voice for Wahlberg's character was provided by Steelheart frontman Miljenko Matijevic for the Steel Dragon Songs.