Question: when did led zeppelin play madison square garden
[{'answer': 'July 1973', 'provenance': [{'wikipedia_id': '8015129', 'title': 'Led Zeppelin concerts', 'start_paragraph_id': 16, 'start_character': 750, 'end_paragraph_id': 16, 'end_character': 759, 'bleu_score': 1.0, 'section': 'Section::::Recordings and live concert footage.\n'}]}, {'provenance': [{'wikipedia_id': '8015129', 'title': 'Led Zeppelin concerts', 'start_paragraph_id': 16, 'start_character': 0, 'end_paragraph_id': 16, 'end_character': 1166, 'bleu_score': 0.9899746208772191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13097268883200780374}, 'section': 'Section::::Recordings and live concert footage.\n'}]}]