Question: when did earth wind and fire come out
[{'answer': '1970', 'provenance': [{'wikipedia_id': '165915', 'title': 'Earth, Wind & Fire', 'start_paragraph_id': 6, 'start_character': 16, 'end_paragraph_id': 6, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}]