Question: who played guitar on top of buckingham palace
[{'answer': 'Brian May', 'provenance': [{'wikipedia_id': '3713271', 'title': 'Party at the Palace', 'start_paragraph_id': 13, 'start_character': 23, 'end_paragraph_id': 13, 'end_character': 32, 'bleu_score': 1.0, 'section': 'Section::::Aspects of concert.\n'}]}, {'provenance': [{'wikipedia_id': '3713271', 'title': 'Party at the Palace', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 768, 'bleu_score': 0.985964042079227, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12753989153606887115}, 'section': 'Section::::Aspects of concert.\n'}]}]