Question: who played guitar for emerson lake and palmer
[{'answer': 'Greg Lake', 'provenance': [{'wikipedia_id': '52725', 'title': 'Emerson, Lake & Palmer', 'start_paragraph_id': 1, 'start_character': 188, 'end_paragraph_id': 1, 'end_character': 197, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '52725', 'title': 'Emerson, Lake & Palmer', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 694, 'bleu_score': 0.9669614708424821, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11961509296864800485}, 'section': 'Section::::Abstract.'}]}]