Question: who wrote the song i'm so glad
[{'answer': 'Skip James', 'provenance': [{'wikipedia_id': '10667485', 'title': "I'm So Glad", 'start_paragraph_id': 1, 'start_character': 83, 'end_paragraph_id': 1, 'end_character': 93, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]