name that Bach song

It was a long time ago that I saw this film, but (having just heard it on the radio) I'm fairly certain that Perkins sings along to the great Toccata in F major by JS Bach, Here's a link to the Amazon MP3 page:
http://www.amazon.co.uk/s/ref=nb_ss_w_h_?url=search-alias%3Ddigital-music&field-keywords=bach+Toccata+in+F+major
You'll need to play it all, because the tune Perkins sings comes in halfway through.
I wonder if you agree with me? It was certainly a wonderful ending, with the lorry representing the sea monster Poseidon in the original Myth.....

It is not a song, but rather a theme occurs several times in the Toccata from Bach's Toccata and Fugue in F Major, BWV 540. Various renditions can be seen and heard on Youtube. Note, however, that different organists play it at different tempos. Those played by Balint Karosi and Arjen Leistra on Youtube seem to approximate the fire imparted by the version used in the movie.

Here it is, being played very well on the organ on/for which Bach composed it: http://www.youtube.com/watch?v=5WX5PPRotSc

All that is visible must grow beyond itself...
http://www.cafepress.co.uk/ahua/8761658

Well...guys... so long!
Thanks for all the good ideas that you've shared here.

It seems these Message Boards will be forever deleted by his majesty IMDb, without any regard to its mere users.
Nice to be talking to you here, the most constructive part of a film page...
(the Review part was the worst, with all the too many ego-filled, pretentious "reviews")