The full title of the fugue is
Fuga all' imitazione della cornetta di postiglione.
The fugue is one of my favorite fugues by Bach.
The piece is very difficult to play on the piano.
Once again, Mathias Müller has meticulously arranged the pieces into audio.
References
Capriccio in B-flat major, BWV 992
Editor Ernst Naumann (1832-1910),
Bach-Gesellschaft Ausgabe, Band 36,
Breitkopf & Härtel,
Leipzig, 1890. Plate B.W. XXXVI.