Question: who did lady gaga do a duet with
[{'answer': 'Tony Bennett', 'provenance': [{'wikipedia_id': '39651083', 'title': 'Cheek to Cheek (album)', 'start_paragraph_id': 1, 'start_character': 60, 'end_paragraph_id': 1, 'end_character': 72, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '39651083', 'title': 'Cheek to Cheek (album)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 670, 'bleu_score': 0.8453027492853311, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17198017068184810032}, 'section': 'Section::::Abstract.'}]}]