Question: when was the sound of music first performed on stage
[{'answer': '1959', 'provenance': [{'wikipedia_id': '30019', 'title': 'The Sound of Music', 'start_paragraph_id': 2, 'start_character': 85, 'end_paragraph_id': 2, 'end_character': 89, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '30019', 'title': 'The Sound of Music', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 573, 'bleu_score': 0.9606438885644071, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15491731093207829459}, 'section': 'Section::::Abstract.'}]}]