This Fugue, from Johann Sebastian Bach's 48 Preludes and Fugues (known as The Well Tempered Clavier), is in 4 parts. With the descending semitone figure repeated several times in the main theme, this fugue is one of the most chromatic of the set and should be played a little slower than its corresponding Prelude in the same key of B minor. This is the original version of the fugue for piano or clavier, but we also have a version for String Quartet. The complete collection of Bach's 48 Preludes and Fugues are available as follows: Book 1 and Book 2 from Sheet Music Plus. The video below is a piano roll animation for the music, or you can play the mp3 file and see the sheet music score before downloading.