Question: who sings lead on steely dan dirty work
[{'answer': 'David Palmer', 'provenance': [{'wikipedia_id': '47292765', 'title': 'Dirty Work (Steely Dan song)', 'start_paragraph_id': 6, 'start_character': 66, 'end_paragraph_id': 6, 'end_character': 78, 'bleu_score': 1.0, 'section': 'Section::::Style and arrangement.\n'}]}]