Question: who sings the original we wish you a merry christmas
[{'answer': 'University of Bristol Madrigal Singers', 'provenance': [{'wikipedia_id': '2492748', 'title': 'We Wish You a Merry Christmas', 'start_paragraph_id': 3, 'start_character': 152, 'end_paragraph_id': 3, 'end_character': 190, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '2492748', 'title': 'We Wish You a Merry Christmas', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 410, 'bleu_score': 0.968982777549629, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10967133690390899456}, 'section': 'Section::::History.\n'}]}]