The Prelude and Fugue in F minor, BWV 881, is a keyboard composition written by Johann Sebastian Bach.
A perfect cadence in A♭ major concludes the small binary, and thus ending the theme of the prelude.
The prelude ends with a two-measure codetta, which consists of a perfect cadence in the home key.
This is followed by the development of the fugue, which has many additional repetitions of the subject in various voices and keys, and occasionally episodes with the same descending fifths sequence as before in between.
After the final repetition of the subject in the tonic key, the descending fifths episode is repeated as a codetta with a Picardy third, which concludes the fugue.