Praeludium Es-Dur

August Wilhelm Bach (1796 – 1869) was a German composer and organist.

He is unrelated to the family of Johann Sebastian Bach. He studied with his father, Gottfried, as well as with Carl Friedrich Zelter and Ludwig Berger.
In 1832, he succeeded Zelter as the director of the Royal Institute of Church Music in Berlin. He also taught at the Prussian Academy of Arts. His compositions largely consist of sacred works and works for keyboard.

He also wrote a pipe organ method and a hymnbook.

This is a very nice small Praeludium in the romantic style of his days.
On IMSLP there are only manuscript copies of his work,

There are three bundles of his compositions in a new affordable edition by:

https://www.stretta-music.com/en/bach-rockstroh-orgelwerke-2-nr-691312.html