Question: who played piano on rock and roll music by the beatles
[{'answer': 'George Martin', 'provenance': [{'wikipedia_id': '1446630', 'title': 'Rock and Roll Music', 'start_paragraph_id': 42, 'start_character': 130, 'end_paragraph_id': 42, 'end_character': 143, 'bleu_score': 1.0, 'section': 'Section::::The Beatles version.:Personnel.\n'}]}]