Question: who played the piano on life on mars
[{'answer': 'Rick Wakeman', 'provenance': [{'wikipedia_id': '1008330', 'title': 'Life on Mars (song)', 'start_paragraph_id': 1, 'start_character': 227, 'end_paragraph_id': 1, 'end_character': 239, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1008330', 'title': 'Life on Mars (song)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 382, 'bleu_score': 0.684718743110806, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14966137328174229888}, 'section': 'Section::::Abstract.'}]}]