Question: who sang vocals for mark wahlberg in rockstar
[{'answer': 'Steelheart frontman Miljenko Matijevic', 'provenance': [{'wikipedia_id': '1530223', 'title': 'Rock Star (2001 film)', 'start_paragraph_id': 12, 'start_character': 59, 'end_paragraph_id': 12, 'end_character': 97, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}, {'provenance': [{'wikipedia_id': '1530223', 'title': 'Rock Star (2001 film)', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 476, 'bleu_score': 0.953902344573157, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17955031551117816613}, 'section': 'Section::::Cast.\n'}]}]