Question: who sings the hell song in the south park movie
[{'answer': 'Metallica lead singer James Hetfield', 'provenance': [{'wikipedia_id': '232795', 'title': 'South Park: Bigger, Longer & Uncut', 'start_paragraph_id': 39, 'start_character': 481, 'end_paragraph_id': 39, 'end_character': 517, 'bleu_score': 1.0, 'section': 'Section::::Production.:Casting.\n'}]}, {'provenance': [{'wikipedia_id': '232795', 'title': 'South Park: Bigger, Longer & Uncut', 'start_paragraph_id': 39, 'start_character': 0, 'end_paragraph_id': 39, 'end_character': 599, 'bleu_score': 0.917608039883496, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5835603221370126039}, 'section': 'Section::::Production.:Casting.\n'}]}]