It is a major organ solo work which requires great dexterity at the organ console for the hands as well as the feet. Probably one of JS Bach's most famous (and often performed too often in concerts)...
Johann Sebastian Bach composed prolific church organ music, the Mass in B Minor, much sacred choral music, and the St Matthew Passion. He wrote Cantatas, Masses and Magnificats, Chorales and...
There are a plethora of recordings of as many different organists that have recorded this great JS Bach work. Each one has their own interpretation of the music and may sound quite different.