Question: who sang don't let the sun go down
[{'answer': 'Elton John', 'provenance': [{'wikipedia_id': '7286053', 'title': "Don't Let the Sun Go Down on Me", 'start_paragraph_id': 1, 'start_character': 70, 'end_paragraph_id': 1, 'end_character': 80, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]