Sonate für Orgel I, 2. Satz - Adagio - by Carl Philipp Emanuel Bach (1714-1788).
The second son of Johann Sebastian, did not look for the music, but of favorable circumstances, made him a great musician. CPE Bach is considered the initiator of the modern form Sonata and the Symphony and was a model for Haydn, Mozart and Beethoven.
The style of this piece is very close to the way "Italian" and is a sublime beauty.