There is a very interesting synchronistic bit with the old Wizard of Oz flick dubbed to the Pink Floyd album, Dark Side of the Moon. It only works through the first run of the album and then the juxtaposition of the Pink Floyd music and lyrics to what is depicted on the film no longer matches or coincides.
The set-up to do this manually is as follows:
(1) Have the Dark Side of the Moon on play mode and paused, cued and ready to go
(2) Play the Wizard of Oz with the volume turned all the way down and wait for the MGM lion
(3) This is important: The lion roars three times. Immediately after the third roar, unpause the Pink Floyd album and turn up the volume to experience what is known as The Dark Side of Oz
As already mentioned, this only lasts as long as the length of the Pink Floyd album (approx.45 mins.) at which point simply enjoy the Wizard of Oz in regular viewing mode. If you dont want to go through all the trouble, a simple google search with the Dark Side of Oz query on google video will do the trick, with the music already dubbed over the movie up to the meeting of the Tin Man as the lingering heart-beats of the Pink Floyd album fades into the background to finish.
Enjoy! It really is quite a treat for those of you who have never tried this before.