This is a fascinating visualization of the Prelude to Bach's Cello Suites.
I like how it shows the chordal and melodic structure in a whole different way; the musical line forming the broken chords and flowing into the melody is quite beautiful visually as well as musically.
Here is a video of the entire visualization:
If you have a recent web browser, you can also use the interactive visualization (written using the HTML5 Canvas for the web developers among you). The developer also has written a blog post describing the visualization.
Wonderful. Well done.