Question: who wrote the song dark as a dungeon
[{'answer': 'Merle Travis', 'provenance': [{'wikipedia_id': '5515195', 'title': 'Dark as a Dungeon', 'start_paragraph_id': 1, 'start_character': 59, 'end_paragraph_id': 1, 'end_character': 71, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5515195', 'title': 'Dark as a Dungeon', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 235, 'bleu_score': 0.953991849837532, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10359803703721953995}, 'section': 'Section::::Abstract.'}]}]