Question: who wrote when the saints go marching in lyrics
[{'answer': 'unclear', 'provenance': [{'wikipedia_id': '2448420', 'title': 'When the Saints Go Marching In', 'start_paragraph_id': 3, 'start_character': 29, 'end_paragraph_id': 3, 'end_character': 36, 'bleu_score': 1.0, 'section': 'Section::::Origins and usage.\n'}]}, {'provenance': [{'wikipedia_id': '2448420', 'title': 'When the Saints Go Marching In', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 947, 'bleu_score': 0.970791317076327, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2000590862719911595}, 'section': 'Section::::Origins and usage.\n'}]}]