Question: who sang oh bla di oh bla da
[{'answer': 'the Beatles', 'provenance': [{'wikipedia_id': '1758815', 'title': 'Ob-La-Di, Ob-La-Da', 'start_paragraph_id': 1, 'start_character': 56, 'end_paragraph_id': 1, 'end_character': 67, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]