Question: who sang moon river in the movie breakfast at tiffany
[{'answer': 'Audrey Hepburn', 'provenance': [{'wikipedia_id': '534458', 'title': 'Moon River', 'start_paragraph_id': 1, 'start_character': 110, 'end_paragraph_id': 1, 'end_character': 124, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '534458', 'title': 'Moon River', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 302, 'bleu_score': 0.963949056609222, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2787621660767103898}, 'section': 'Section::::Abstract.'}]}]