Question: when was the first piece of music made
[{'answer': 'unknown', 'provenance': [{'wikipedia_id': '87323', 'title': 'History of music', 'start_paragraph_id': 6, 'start_character': 468, 'end_paragraph_id': 6, 'end_character': 475, 'bleu_score': 1.0, 'section': 'Section::::Eras of music.:Prehistoric music.\n'}]}, {'provenance': [{'wikipedia_id': '87323', 'title': 'History of music', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 958, 'bleu_score': 0.9685451587663261, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9989710920206059807}, 'section': 'Section::::Eras of music.:Prehistoric music.\n'}]}]