Question: who wrote o brother where art thou soundtrack
[{'answer': 'the Coen Brothers', 'provenance': [{'wikipedia_id': '194349', 'title': 'O Brother, Where Art Thou? (soundtrack)', 'start_paragraph_id': 1, 'start_character': 140, 'end_paragraph_id': 1, 'end_character': 157, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '194349', 'title': 'O Brother, Where Art Thou? (soundtrack)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 236, 'bleu_score': 0.950578622812921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8199817221230589062}, 'section': 'Section::::Abstract.'}]}]