Question: who sang lead vocals on horse with no name
[{'answer': 'Dewey Bunnell', 'provenance': [{'wikipedia_id': '4185966', 'title': 'A Horse with No Name', 'start_paragraph_id': 1, 'start_character': 44, 'end_paragraph_id': 1, 'end_character': 57, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]