http://www.youtube.com/watch?v=WZfDgDaNCqU
When I first heard a recording of this piece some years ago it was like someone giving me an electric shock! I suppose it reawakened my enthusiasm for the pipe organ.
The link above is a performance by Marie Claire Alain who in my opinion is probably one of the greatest organists of the 20th century, however the recording which I can not find on Youtube and that I have on an old Westminster record is by Marcel Dupre, and that one is truely stunning. The recording techniques of the time could not cope with the massive crescendo from the Saint Suplice organ however the resulting effect still sends shivers down your spine.
I'm sorry for pinching this picture off Jeremy Filsells website, but this is the same picture featured on the front cover of the Westminster record
(http://www.jeremyfilsell.com/uploads/images/Dupre%201948.JPG)