The "Well-Tempered Clavier" is a collection of two volumes of keyboard music composed by Johann Sebastian Bach. Each volume contains 24 preludes and fugues, covering all major and minor keys. This work is significant for its exploration of harmony and counterpoint, showcasing Bach's mastery of composition. First published in 1722 and later in 1742, the "Well-Tempered Clavier" serves as an important pedagogical tool for musicians. It is often used to teach the fundamentals of Western classical music and is celebrated for its intricate melodies and complex structures, influencing countless composers and musicians throughout history.