Question: who played piano on bat out of hell
[{'answer': 'Roy Bittan', 'provenance': [{'wikipedia_id': '370650', 'title': 'Bat Out of Hell', 'start_paragraph_id': 7, 'start_character': 292, 'end_paragraph_id': 7, 'end_character': 302, 'bleu_score': 1.0, 'section': 'Section::::Pre-production.\n'}]}, {'answer': 'Steve Margoshes', 'provenance': [{'wikipedia_id': '370650', 'title': 'Bat Out of Hell', 'start_paragraph_id': 57, 'start_character': 12, 'end_paragraph_id': 57, 'end_character': 27, 'bleu_score': 1.0, 'section': 'Section::::Personnel.:Arrangements.\n'}]}, {'answer': 'Cheryl Hardwick', 'provenance': [{'wikipedia_id': '370650', 'title': 'Bat Out of Hell', 'start_paragraph_id': 64, 'start_character': 12, 'end_paragraph_id': 64, 'end_character': 27, 'bleu_score': 1.0, 'section': 'Section::::Personnel.:Band.\n'}]}]