Question: when did the rolling stones become a band
[{'answer': '1962', 'provenance': [{'wikipedia_id': '31056', 'title': 'The Rolling Stones', 'start_paragraph_id': 1, 'start_character': 64, 'end_paragraph_id': 1, 'end_character': 68, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '31056', 'title': 'The Rolling Stones', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1132, 'bleu_score': 0.572635574285698, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7150251695622751270}, 'section': 'Section::::Abstract.'}]}]