Question: who wrote song say you wont let go
[{'answer': 'James Arthur', 'provenance': [{'wikipedia_id': '51574370', 'title': "Say You Won't Let Go", 'start_paragraph_id': 1, 'start_character': 66, 'end_paragraph_id': 1, 'end_character': 78, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '51574370', 'title': "Say You Won't Let Go", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 671, 'bleu_score': 0.7853240982567451, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16797576557833681920}, 'section': 'Section::::Abstract.'}]}]