It's pretty well known that Google uses doodles and other quirky things to showcase cool features of new web technologies (eg. pacman). This is showcasing the new(ish) web audio API. I think it's a neat way to get some eyes on what's happening on the web these days. It promotes the open web and I'm glad there are a few big companies out there who are pushing these things forward.
If you don't like the post, downvote, but there's a reason why most techies like these sort of tech demos and we especially like it when we see a big company using them.
They aren't locking other browsers out (my FF 11 on Linux is working adequately). They're going to market regardless, I'd rather see things like this than raw ads.
I assume you never use Google since they just use search to push their ads?
If you don't like the post, downvote, but there's a reason why most techies like these sort of tech demos and we especially like it when we see a big company using them.