Question: when did the warlocks became the grateful dead
[{'answer': '1965', 'provenance': [{'wikipedia_id': '12542', 'title': 'Grateful Dead', 'start_paragraph_id': 1, 'start_character': 54, 'end_paragraph_id': 1, 'end_character': 58, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '12542', 'title': 'Grateful Dead', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 879, 'bleu_score': 0.6403081580366511, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10985454347662312145}, 'section': 'Section::::Formation (1965–1966).\n'}]}]