Question: who sings the original jingle bell rock song
[{'answer': 'Bobby Helms', 'provenance': [{'wikipedia_id': '3390835', 'title': 'Jingle Bell Rock', 'start_paragraph_id': 1, 'start_character': 75, 'end_paragraph_id': 1, 'end_character': 86, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3390835', 'title': 'Jingle Bell Rock', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 538, 'bleu_score': 0.8639871199345691, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4885574138750099836}, 'section': 'Section::::Abstract.'}]}]