Question: who sang for george clooney in o brother where art thou
[{'answer': 'Dan Tyminski', 'provenance': [{'wikipedia_id': '194349', 'title': 'O Brother, Where Art Thou? (soundtrack)', 'start_paragraph_id': 7, 'start_character': 320, 'end_paragraph_id': 7, 'end_character': 332, 'bleu_score': 1.0, 'section': 'Section::::Development and sound.\n'}]}, {'provenance': [{'wikipedia_id': '194349', 'title': 'O Brother, Where Art Thou? (soundtrack)', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 565, 'bleu_score': 0.9545695715275291, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2730435195316141570}, 'section': 'Section::::Reception and legacy.\n'}]}]