Question: who sang when i grow too old to dream
[{'answer': 'Nat King Cole', 'provenance': [{'wikipedia_id': '13344780', 'title': 'When I Grow Too Old to Dream', 'start_paragraph_id': 2, 'start_character': 168, 'end_paragraph_id': 2, 'end_character': 181, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'The Everly Brothers', 'provenance': [{'wikipedia_id': '13344780', 'title': 'When I Grow Too Old to Dream', 'start_paragraph_id': 2, 'start_character': 183, 'end_paragraph_id': 2, 'end_character': 202, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Gracie Fields', 'provenance': [{'wikipedia_id': '13344780', 'title': 'When I Grow Too Old to Dream', 'start_paragraph_id': 2, 'start_character': 207, 'end_paragraph_id': 2, 'end_character': 220, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Evelyn Laye', 'provenance': [{'wikipedia_id': '13344780', 'title': 'When I Grow Too Old to Dream', 'start_paragraph_id': 2, 'start_character': 27, 'end_paragraph_id': 2, 'end_character': 38, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]