Question: who sang the original swing low sweet chariot
[{'answer': 'the Fisk Jubilee Singers', 'provenance': [{'wikipedia_id': '975019', 'title': 'Swing Low, Sweet Chariot', 'start_paragraph_id': 1, 'start_character': 104, 'end_paragraph_id': 1, 'end_character': 128, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '975019', 'title': 'Swing Low, Sweet Chariot', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 147, 'bleu_score': 0.9181891462193901, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12354720971254674511}, 'section': 'Section::::Abstract.'}]}]