Question: who sang the song a change is going to come
[{'answer': 'Sam Cooke', 'provenance': [{'wikipedia_id': '3033793', 'title': 'A Change Is Gonna Come', 'start_paragraph_id': 1, 'start_character': 64, 'end_paragraph_id': 1, 'end_character': 73, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3033793', 'title': 'A Change Is Gonna Come', 'start_paragraph_id': 1, 'start_character': 160, 'end_paragraph_id': 1, 'end_character': 369, 'bleu_score': 0.537610205374192, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12790843930810076123}, 'section': 'Section::::Abstract.'}]}]