I'm not sure how milkshake is generating it's visualizations, but with Vizrify I was playing with using the new WebAudio API (which will be coming to firefox in a while) to access html5 audio element FFT data directly. It also opens up the avenue to do other cool audio transformations that are difficult to do otherwise.

Oh ok, sounds cool. :) In which chrome version did it get supported?

I'm trying on chromium 23 on Linux Mint and only see 2 concentric circles and nothing is playing / moving.

Though here it seems not to complain like it does in FF when in chromium and I could hit a random play button on the page:

http://www.html5rocks.com/en/tutorials/webaudio/intro/

cheers!

I've experienced some users reporting bugs using chromium and ubuntu, I haven't had a chance to look into it, thanks for letting me know!