Question: who wrote the song down in the valley
[{'answer': 'Jimmie Tarlton', 'provenance': [{'wikipedia_id': '19338941', 'title': 'Down in the Valley (folk song)', 'start_paragraph_id': 3, 'start_character': 10, 'end_paragraph_id': 3, 'end_character': 24, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]