Question: who played on the ballad of john and yoko
[{'answer': 'McCartney', 'provenance': [{'wikipedia_id': '1885347', 'title': 'The Ballad of John and Yoko', 'start_paragraph_id': 1, 'start_character': 83, 'end_paragraph_id': 1, 'end_character': 92, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Lennon', 'provenance': [{'wikipedia_id': '1885347', 'title': 'The Ballad of John and Yoko', 'start_paragraph_id': 1, 'start_character': 56, 'end_paragraph_id': 1, 'end_character': 62, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1885347', 'title': 'The Ballad of John and Yoko', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 434, 'bleu_score': 0.970362113628587, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6612179814417648685}, 'section': 'Section::::Recording.\n'}]}]