Question: when did michael jackson started his music career
[{'answer': '1964', 'provenance': [{'wikipedia_id': '14995351', 'title': 'Michael Jackson', 'start_paragraph_id': 2, 'start_character': 79, 'end_paragraph_id': 2, 'end_character': 83, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '14995351', 'title': 'Michael Jackson', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1030, 'bleu_score': 0.640590083524273, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 823108334131915213}, 'section': 'Section::::Abstract.'}]}]