The Well-Tempered Clavier, BWV 846–893, is a collection of two series of Preludes and Fugues in all 24 major and minor keys, composed for solo keyboard by Johann Sebastian Bach. In the German of Bach's time Clavier (keyboard) was a generic name indicating a variety of keyboard instruments, most typically a harpsichord or clavichord – but not excluding an organ either.

Date of composition 1740
Type Preludes and Fugues
Tonality B-flat Minor
Catalogue BWV 891
Instruments Clavichord
Links
Autotranslations beta Jean-Sébastien Bach: Prelude and Fugue en si bémol mineur, BWV 891
Johann Sebastian Bach: Prelude and Fugue in si bemolle minore, BWV 891
Johann Sebastian Bach: Prelude and Fugue b-moll, BWV 891