Question: who sang lead vocals on do it again
[{'answer': 'Steely Dan', 'provenance': [{'wikipedia_id': '7178093', 'title': 'Do It Again (Steely Dan song)', 'start_paragraph_id': 0, 'start_character': 13, 'end_paragraph_id': 0, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '7178093', 'title': 'Do It Again (Steely Dan song)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 304, 'bleu_score': 0.9632870032952191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7654516460114095825}, 'section': 'Section::::Abstract.'}]}]