SuperCollider is an audio environment that gets a lot of things right in terms of hacking around with multichannel sound, live coding and composing the different structures you need for music.
I think there's at least one I've forgotten. Please let me know if you spot others, I'd be interested to keep tabs.
So there are obvious questions: is this a duplication of effort? should these people get together and hack on one system? is any one of them better than the others? I don't know if any of them is better, but one thing I know: it's still very early days in the world of Web Audio. (The underlying APIs aren't even implemented fully by all major browsers yet.) I'm sure some cool live coding web systems will emerge, and they may or may not be based on the older generation. But there's still plenty of room for experimentation.