Question: who sang the national anthem at the super bowl 2013
[{'answer': 'Alicia Keys', 'provenance': [{'wikipedia_id': '15376140', 'title': 'List of national anthem performers at the Super Bowl', 'start_paragraph_id': 41, 'start_character': 18, 'end_paragraph_id': 41, 'end_character': 29, 'bleu_score': 1.0, 'section': 'Section::::Other patriotic performances.\n'}]}]