Question: who sang suite judy blue eyes at woodstock
[{'answer': 'Crosby , Stills & Nash', 'provenance': [{'wikipedia_id': '1542218', 'title': 'Suite: Judy Blue Eyes', 'start_paragraph_id': 1, 'start_character': 77, 'end_paragraph_id': 1, 'end_character': 100, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]