Question: who sang backing vocals on money for nothing
[{'answer': 'Sting', 'provenance': [{'wikipedia_id': '1614455', 'title': 'Money for Nothing (song)', 'start_paragraph_id': 1, 'start_character': 295, 'end_paragraph_id': 1, 'end_character': 300, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1614455', 'title': 'Money for Nothing (song)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 525, 'bleu_score': 0.978138775770484, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3798517737265518214}, 'section': 'Section::::Abstract.'}]}]