Question: who sings shy in once upon a mattress
[{'answer': 'Princess Winnifred', 'provenance': [{'wikipedia_id': '1259842', 'title': 'Once Upon a Mattress', 'start_paragraph_id': 4, 'start_character': 585, 'end_paragraph_id': 4, 'end_character': 603, 'bleu_score': 1.0, 'section': 'Section::::Productions.\n'}]}, {'answer': 'Knights', 'provenance': [{'wikipedia_id': '1259842', 'title': 'Once Upon a Mattress', 'start_paragraph_id': 20, 'start_character': 416, 'end_paragraph_id': 20, 'end_character': 423, 'bleu_score': 1.0, 'section': 'Section::::Plot.:Act I.\n'}]}, {'answer': 'Ladies', 'provenance': [{'wikipedia_id': '1259842', 'title': 'Once Upon a Mattress', 'start_paragraph_id': 22, 'start_character': 45, 'end_paragraph_id': 22, 'end_character': 51, 'bleu_score': 1.0, 'section': 'Section::::Plot.:Act I.\n'}]}, {'provenance': [{'wikipedia_id': '1259842', 'title': 'Once Upon a Mattress', 'start_paragraph_id': 37, 'start_character': 0, 'end_paragraph_id': 37, 'end_character': 56, 'bleu_score': 0.6803749333171201, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17300827261398924089}, 'section': 'Section::::Musical numbers.\n'}]}]