Question: when did the song free bird come out
[{'answer': '1973', 'provenance': [{'wikipedia_id': '1124299', 'title': 'Free Bird', 'start_paragraph_id': 1, 'start_character': 151, 'end_paragraph_id': 1, 'end_character': 155, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1124299', 'title': 'Free Bird', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 294, 'bleu_score': 0.8046309303230541, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6733075277419021478}, 'section': 'Section::::Abstract.'}]}]