Question: who is currently the lead singer of chicago
[{'answer': 'Neil Donell', 'provenance': [{'wikipedia_id': '168876', 'title': 'Chicago (band)', 'start_paragraph_id': 63, 'start_character': 218, 'end_paragraph_id': 63, 'end_character': 229, 'bleu_score': 1.0, 'section': 'Section::::Group history.:2010–present.\n'}]}, {'provenance': [{'wikipedia_id': '168876', 'title': 'Chicago (band)', 'start_paragraph_id': 63, 'start_character': 0, 'end_paragraph_id': 63, 'end_character': 519, 'bleu_score': 0.7214894081254181, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2407027715512484585}, 'section': 'Section::::Group history.:2010–present.\n'}]}]