Nice idea. I have previously used https://jukebox.today will try this out. Source: over 1 year ago

If you want some music, you can put together a playlist that people can listen to in real time. I've never used this website, but https://jukebox.today/ is an example of something you can use to do this. Hope this helps! Source: almost 2 years ago

I found jukebox.com (I have never used it, but here is a brief description). Source: over 2 years ago

Genius was working on something similar for a while, but I don't think it ever took off: https://genius.com/web-annotator. - Source: Hacker News / over 1 year ago

Does Genius Web Annotator still work? I used it years ago and found it pretty handy: https://genius.com/web-annotator. - Source: Hacker News / almost 2 years ago

Maybe try some of these https://genius.com/web-annotator https://www.getpoint.co/. - Source: Hacker News / over 2 years ago

The lyrics site Genius also attempted this[1][2] 1. https://genius.com/web-annotator. - Source: Hacker News / over 2 years ago

I think people have done stuff like this? Maybe not for full (and long) novels, but at least for non-fiction articles. Here's a place which has a tool for that: https://genius.com/web-annotator. Source: about 3 years ago