Question: when was the little drummer boy song written
[{'answer': '1941', 'provenance': [{'wikipedia_id': '1145333', 'title': 'The Little Drummer Boy', 'start_paragraph_id': 1, 'start_character': 185, 'end_paragraph_id': 1, 'end_character': 189, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1145333', 'title': 'The Little Drummer Boy', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 440, 'bleu_score': 0.936655266249045, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 642182993837402086}, 'section': 'Section::::Abstract.'}]}]