Question: who played lead guitar on for what it's worth
[{'answer': 'David Cassidy', 'provenance': [{'wikipedia_id': '1215271', 'title': "For What It's Worth", 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 13, 'bleu_score': 1.0, 'section': 'Section::::Covers and sampling.\n'}]}]