Question: who sang for carson on his next to last episode
[{'answer': 'Bette Midler', 'provenance': [{'wikipedia_id': '2805979', 'title': 'The Tonight Show Starring Johnny Carson', 'start_paragraph_id': 86, 'start_character': 72, 'end_paragraph_id': 86, 'end_character': 84, 'bleu_score': 1.0, 'section': "Section::::Carson's last shows.\n"}]}, {'provenance': [{'wikipedia_id': '2805979', 'title': 'The Tonight Show Starring Johnny Carson', 'start_paragraph_id': 86, 'start_character': 0, 'end_paragraph_id': 86, 'end_character': 1335, 'bleu_score': 0.9912085779363331, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5308667288306663998}, 'section': "Section::::Carson's last shows.\n"}]}]