Question: who sings lead vocals on stuck in the middle with you
[{'answer': 'Gerry Rafferty', 'provenance': [{'wikipedia_id': '925085', 'title': 'Stuck in the Middle with You', 'start_paragraph_id': 1, 'start_character': 114, 'end_paragraph_id': 1, 'end_character': 128, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '925085', 'title': 'Stuck in the Middle with You', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 326, 'bleu_score': 0.9196822664155291, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11331886677090292772}, 'section': 'Section::::Overview.\n'}]}]