Question: who sang the song uncle tom's cabin
[{'answer': 'Warrant', 'provenance': [{'wikipedia_id': '33842930', 'title': "Uncle Tom's Cabin (song)", 'start_paragraph_id': 1, 'start_character': 47, 'end_paragraph_id': 1, 'end_character': 54, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '33842930', 'title': "Uncle Tom's Cabin (song)", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 320, 'bleu_score': 0.96746874041754, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14112449079766368067}, 'section': 'Section::::Abstract.'}]}]