Question: when did they start singing god bless america at baseball games
[{'answer': 'September 11 attacks', 'provenance': [{'wikipedia_id': '941491', 'title': 'Seventh-inning stretch', 'start_paragraph_id': 1, 'start_character': 637, 'end_paragraph_id': 1, 'end_character': 657, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '941491', 'title': 'Seventh-inning stretch', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1082, 'bleu_score': 0.9893895451459531, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11459094137034191079}, 'section': 'Section::::Abstract.'}]}]