Question: who composed the series of instrumental works known as the well-tempered clavier
[{'answer': 'Johann Sebastian Bach', 'provenance': [{'wikipedia_id': '25496497', 'title': 'The Well-Tempered Clavier', 'start_paragraph_id': 1, 'start_character': 153, 'end_paragraph_id': 1, 'end_character': 174, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '25496497', 'title': 'The Well-Tempered Clavier', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 355, 'bleu_score': 0.800172160488368, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3975742291416141747}, 'section': 'Section::::Abstract.'}]}]