Question: when was the song let her go written
[{'answer': 'July 2012', 'provenance': [{'wikipedia_id': '38195721', 'title': 'Let Her Go', 'start_paragraph_id': 1, 'start_character': 346, 'end_paragraph_id': 1, 'end_character': 355, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '38195721', 'title': 'Let Her Go', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 599, 'bleu_score': 0.9331600394719781, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 857995211026288323}, 'section': 'Section::::Commercial performance.\n'}]}]