I would like to add one more thing, only because I care a lot about the product:

A shared song link should be a waveform print, and not change in any way in the future. Otherwise, how do I know what I am sharing?

I would imagine the the models may be changing, but now that you are public, you need to lock this aspect of the UX down.

https://news.ycombinator.com/item?id=38754720