The prelude in e-flat major BWV 552, written by Johann Sebastian Bach, belongs to a collection (begun in 1735-36 and published in 1739) and known as "German Organ Mass" (third part of the Clavier-Übung).
This collection has the structure of the organ Mass: the prelude of the video which you can listen to is the initial movement, then 21 Chorale Preludes (BWV 669-689) and finally the triple Fugue in e-flat major BWV 552.
In the video you can hear Luca Raggi on Schwindler console, hauptwerk system (sample set of Marcussen & Son organ, Laurenskerk, Rotterdam), good listening!
![](https://i.ytimg.com/vi/ANCC81ILfzI/maxresdefault.jpg)