Question: who held a live performance on the roof top of three savil road of mayfair in 1969
[{'answer': 'The Beatles', 'provenance': [{'wikipedia_id': '830156', 'title': 'Savile Row', 'start_paragraph_id': 18, 'start_character': 409, 'end_paragraph_id': 18, 'end_character': 420, 'bleu_score': 1.0, 'section': 'Section::::History.:Twentieth century.\n'}]}, {'provenance': [{'wikipedia_id': '830156', 'title': 'Savile Row', 'start_paragraph_id': 18, 'start_character': 0, 'end_paragraph_id': 18, 'end_character': 715, 'bleu_score': 0.9839344367380701, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2042518504675522582}, 'section': 'Section::::History.:Twentieth century.\n'}]}]