Question: who sings bridge over troubled water simon or garfunkel
[{'answer': 'Art Garfunkel', 'provenance': [{'wikipedia_id': '634661', 'title': 'Bridge over Troubled Water (song)', 'start_paragraph_id': 2, 'start_character': 217, 'end_paragraph_id': 2, 'end_character': 230, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '634661', 'title': 'Bridge over Troubled Water (song)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 599, 'bleu_score': 0.9808590314834971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1952769724040425573}, 'section': 'Section::::Abstract.'}]}]