Answer :
The Art of Fugue and The Well-Tempered Clavier are the keyboard works by j. s. Bach.
Johann Sebastian Bach composed two sets of preludes and fugues for the keyboard in all 24 major and minor keys, known collectively as the Well-Tempered Clavier (BWV 846–893). When the composer was alive, the term "clavier," which is French for "keyboard," was used to describe a wide range of musical instruments, most frequently the clavichord or harpsichord but not exclusively.
A collection of preludes and fugues, published in 1722 and available in all 24 major and minor keys, was given the name Das Wohltemperirte Clavier by Bach. It was written "for the profit and use of musical youth desirous of learning, and especially for the amusement of those already skilled in this study." A second book of this type was prepared by Bach around 20 years later; it was dubbed The Well-Tempered Clavier.
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