Question: who originally sang the song walking in memphis
[{'answer': 'Marc Cohn', 'provenance': [{'wikipedia_id': '4690382', 'title': 'Walking in Memphis', 'start_paragraph_id': 1, 'start_character': 94, 'end_paragraph_id': 1, 'end_character': 103, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]