Question: who sang the song cotton fields back home
[{'answer': 'Huddie Ledbetter', 'provenance': [{'wikipedia_id': '4820327', 'title': 'Cotton Fields', 'start_paragraph_id': 1, 'start_character': 61, 'end_paragraph_id': 1, 'end_character': 77, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4820327', 'title': 'Cotton Fields', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 155, 'bleu_score': 0.9271474438253491, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3183145679377318954}, 'section': 'Section::::Abstract.'}]}]