Question: who sings vocals on the nights by avicii
[{'answer': 'Nicholas Furlong', 'provenance': [{'wikipedia_id': '18053217', 'title': 'The Nights', 'start_paragraph_id': 1, 'start_character': 116, 'end_paragraph_id': 1, 'end_character': 132, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18053217', 'title': 'The Nights', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 580, 'bleu_score': 0.854616956446763, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12985843909138856970}, 'section': 'Section::::Abstract.'}]}]