Question: who sings with bing crosby on silver bells
[{'answer': 'Carol Richards', 'provenance': [{'wikipedia_id': '3215288', 'title': 'Silver Bells', 'start_paragraph_id': 2, 'start_character': 310, 'end_paragraph_id': 2, 'end_character': 324, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3215288', 'title': 'Silver Bells', 'start_paragraph_id': 2, 'start_character': 129, 'end_paragraph_id': 2, 'end_character': 620, 'bleu_score': 0.923485369499194, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9477119456536826335}, 'section': 'Section::::Abstract.'}]}]