Prelude, Fugue, and Allegro in E-Flat Major (arranged for guitar, it is usually played in D Major with a Drop D tuning), BWV 998, is a musical composition written by Johann Sebastian Bach for Lute or Harpsichord. The piece was written around 1735.
Prelude and Fugue in A minor, is a piece of organ music written by Bach sometime around his years as court organist to the Duke of Saxe-Weimar (1708–1717). Because of the piece’s overall rhapsodic nature, many organists play this piece freely, and in a variety of tempi.
The Well-Tempered Clavier, BWV 846–893, is a collection of two sets of preludes and fugues in all 24 major and minor keys, composed for solo keyboard by Johann Sebastian Bach. The Prelude and Fugue XIII is in F-sharp major.