You should know that I like music, but I am not musical in any way. I have difficulty playing an iPod. But I found it fascinating to watch, and listen. The animation immediately shows how the music is played, which reaffirms my belief that I am destined never to be able to play an instrument. It also shows the complexity, and some of the mathematical structure, of this work by Bach.
Check it out here.
There are a whole lot more videos out there showing these animations...enjoy.