Question: who sang the original version of the sound of silence
[{'answer': 'Simon & Garfunkel', 'provenance': [{'wikipedia_id': '26823', 'title': 'Simon & Garfunkel', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '26823', 'title': 'Simon & Garfunkel', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 359, 'bleu_score': 0.5215141953910051, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17693840535035403768}, 'section': 'Section::::Abstract.'}]}]