I just loved it! If itunes had something like that on its visualizations it would allways turned on. Yes it needs a little bit fine tuning... but you're on a good way!
It would also be nice other experiments... perhaps some way to communicate sound trough words in different typefaces and weights.

"some way to communicate sound trough words in different typefaces and weights"

this is a quite interesting idea. While I was doing this I found out that if I increase proportionally the size of each part I would have had in most cases a seamless bolder weight. I'm going to publish this variant as well asap!

[update] : i have done some changes. Full info at the address above:

http://www.tezzutezzu.com/blog/typography/dancingtype

It's getting better. :^)