Music folks, there's a site called BeepBox (BeepBox.co) which is like a tracker you can run in your browser. I used to share little compositions with it. I don't have any handy at the moment but that's not really relevant for why I'm mentioning it now.

If you share the URL to a creation, someone can make modifications, add, or remix it. It doesn't impact the original URL's composition. So you can share links around and collaborate with others just by passing links around.