Question: who sang lead vocals on 25 or 6 to 4
[{'answer': 'Jason Scheff', 'provenance': [{'wikipedia_id': '6728416', 'title': '25 or 6 to 4', 'start_paragraph_id': 2, 'start_character': 141, 'end_paragraph_id': 2, 'end_character': 153, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6728416', 'title': '25 or 6 to 4', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 316, 'bleu_score': 0.8590195673115991, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1304389650780041195}, 'section': 'Section::::Abstract.'}]}]