Question: who was the first to sing proud mary
[{'answer': 'Creedence Clearwater Revival', 'provenance': [{'wikipedia_id': '3235632', 'title': 'Proud Mary', 'start_paragraph_id': 1, 'start_character': 91, 'end_paragraph_id': 1, 'end_character': 119, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3235632', 'title': 'Proud Mary', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 627, 'bleu_score': 0.9368600533833571, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3496584809797564378}, 'section': 'Section::::Abstract.'}]}]