Question: who sang what a lucky man he was
[{'answer': 'Greg Lake', 'provenance': [{'wikipedia_id': '24618830', 'title': 'Lucky Man (Emerson, Lake & Palmer song)', 'start_paragraph_id': 1, 'start_character': 147, 'end_paragraph_id': 1, 'end_character': 156, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]