Question: who is the lead singer of pure prairie league
[{'answer': 'Craig Fuller', 'provenance': [{'wikipedia_id': '532032', 'title': 'Pure Prairie League', 'start_paragraph_id': 1, 'start_character': 128, 'end_paragraph_id': 1, 'end_character': 140, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '532032', 'title': 'Pure Prairie League', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 808, 'bleu_score': 0.9678713199044161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18225188690950327212}, 'section': 'Section::::Abstract.'}]}]