Johann Caspar Simon (1701-1776) was a German composer, organist and teacher of the baroque period. He composed many pieces for keyboard instruments. I recorded a prelude and fugue in E minor of the collection of Leichte Praeludia und Fugen. Which roughly all follow the same pattern, a short and free prelude (often with a lot of scales) followed by a short fugue. The title of the collection says that the pieces can be played on organ, but also on the clavichord.