Question: who played piano on cat stevens morning has broken
[{'answer': 'Rick Wakeman', 'provenance': [{'wikipedia_id': '1849849', 'title': 'Morning Has Broken', 'start_paragraph_id': 7, 'start_character': 208, 'end_paragraph_id': 7, 'end_character': 220, 'bleu_score': 1.0, 'section': 'Section::::Cat Stevens recording.\n'}]}, {'provenance': [{'wikipedia_id': '1849849', 'title': 'Morning Has Broken', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 316, 'bleu_score': 0.7547240858669041, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9165610340500073657}, 'section': 'Section::::Cat Stevens recording.\n'}]}]