Question: what is the most recorded christmas song in history
[{'answer': "`` White Christmas ''"}, {'provenance': [{'wikipedia_id': '153569', 'title': 'Christmas music', 'start_paragraph_id': 230, 'start_character': 0, 'end_paragraph_id': 230, 'end_character': 485, 'bleu_score': 0.8409682712135431, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8309059923297031179}, 'section': 'Section::::Non-Christian writers.\n'}]}]