What's neat about the OP's video is that it shows the "periodicity" of the various octaves.
Back in college (1996 or so -- it was on one of the first PowerPC macs) I put together an animation for a class project that was sort of a combination of the two using Bach's Invention #13.
The view was of traveling down a tunnel of a sort of swirly green fog. Each note was represented by a little yellow or magenta stripe painted on the inside of the tunnel, based on which "part" (i.e. hand) was playing it. The angular position was determined by the pitch (which wrapped around at each octave), and the length of the stripe was determined by the duration of the note. All in all it was a really effective way of visualizing the song.
I wish I would've videotaped it, because the source code is long gone and wouldn't run on modern hardware anyway.
Cool! This is a great way to visualize the relationship of notes in a chord. One of the harder things to teach in beginning music theory are chord forms, since it requires thinking relatively, rather than absolutely. Major and minor chords are related together not because of the notes themselves, but because of the intervals between them.
In this visualization, though, all the related chords are roughly the same shape. Seems like it'd be a great way to harness visual thinking to teach a more abstract concept.
Two-dimensional keyboard layouts mostly use regular chord shapes. It makes both theory and playability come a lot more easily - two fingerings per scale and chord, no adjustments for different keys. I own an Axis 49 and while I'll admit it isn't perfect for existing repertoire, it excels in every other respect. If you want to "learn music" this is the fastest way to do it.
Those notes show an example of a spiral pitch representation and discuss chromagrams (mapping complex wave forms to pitch classes) as well as other concepts.
For a deeper look, check out the book Signals Sound and Sensation by William M. Hartmann.
I wonder how playable a spiral pyramid version of that would be; I've long thought that a long line must be a suboptimal piano layout (like a single long alphabetic row would be bad for typing).
Toccata and Fugue http://www.youtube.com/watch?v=ipzR9bhei_o
"Little" Fugue http://www.youtube.com/watch?v=pVadl4ocX0M
Also enjoyable: Debussy's Clair de lune http://www.youtube.com/watch?v=LlvUepMa31o