Question: who played piano on day in the life
[{'answer': 'John Lennon', 'provenance': [{'wikipedia_id': '143425', 'title': 'A Day in the Life', 'start_paragraph_id': 1, 'start_character': 229, 'end_paragraph_id': 1, 'end_character': 240, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Paul McCartney', 'provenance': [{'wikipedia_id': '143425', 'title': 'A Day in the Life', 'start_paragraph_id': 1, 'start_character': 247, 'end_paragraph_id': 1, 'end_character': 261, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Ringo Starr', 'provenance': [{'wikipedia_id': '143425', 'title': 'A Day in the Life', 'start_paragraph_id': 5, 'start_character': 333, 'end_paragraph_id': 5, 'end_character': 344, 'bleu_score': 1.0, 'section': 'Section::::Background.\n'}]}, {'answer': 'Mal Evans', 'provenance': [{'wikipedia_id': '143425', 'title': 'A Day in the Life', 'start_paragraph_id': 21, 'start_character': 324, 'end_paragraph_id': 21, 'end_character': 333, 'bleu_score': 1.0, 'section': 'Section::::Musical structure and development.:Basic track.\n'}]}]