Question: what key does a tenor sax play in
[{'answer': 'B ♭', 'provenance': [{'wikipedia_id': '926172', 'title': 'Tenor saxophone', 'start_paragraph_id': 1, 'start_character': 232, 'end_paragraph_id': 1, 'end_character': 234, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '926172', 'title': 'Tenor saxophone', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 645, 'bleu_score': 0.9476513497308051, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14577673379700465413}, 'section': 'Section::::Abstract.'}]}]