Question: who sang the duet at the end of beauty and the beast
[{'answer': 'Ariana Grande', 'provenance': [{'wikipedia_id': '3725773', 'title': 'Beauty and the Beast (Disney song)', 'start_paragraph_id': 4, 'start_character': 150, 'end_paragraph_id': 4, 'end_character': 163, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'John Legend', 'provenance': [{'wikipedia_id': '3725773', 'title': 'Beauty and the Beast (Disney song)', 'start_paragraph_id': 4, 'start_character': 168, 'end_paragraph_id': 4, 'end_character': 179, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3725773', 'title': 'Beauty and the Beast (Disney song)', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 316, 'bleu_score': 0.96746874041754, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4819082884417999173}, 'section': 'Section::::Abstract.'}]}]