"The Well-Tempered Clavier" is a famous collection of keyboard music composed by Johann Sebastian Bach. It consists of two volumes, each containing 24 preludes and fugues in all major and minor keys. This work showcases Bach's mastery of counterpoint and harmony, making it a cornerstone of classical music education. The title refers to the concept of well temperament, a tuning system that allows instruments to play in all keys without sounding out of tune. This innovative approach enabled composers to explore different musical ideas, and Bach's compositions remain influential, inspiring countless musicians and composers throughout history.