No - I think he should try Bach's Fugue in G Major (the Jig).

Here's a link where you can hear the piece.

http://www.agohq.org/guide/pages/index1.html

And then choose the link in the sentence "Choose an organ piece while browsing"

The rest of the links are part of the "Young Person's Guide to the Organ" - a well done introduction to how an organ works.