Hi!
I believe you mentioned it in the Obsidian for Musicians thread, but noonesimg/obsidian-audio-player seems pretty close to what you are looking for, at least for audio files. What do you think is missing there?
In case you are interested, I am actively working on a fork of the plugin. My version is meant to be tailored for annotating music specifically, so I called it music-player. I’m using it in my music library and knowledge base vault, which includes song reviews I write by adding comments on time windows. Unlike the OG, this plugin supports Markdown in comments – meaning that the comments themselves can link to other notes with embedded players, so when hovering on the link you can directly play the linked audio. This is really cool for referencing other songs from the current one, and being able to play them side-by-side. See the demo video on the README.
The crowning jewel here would be the possibility to link to timestamp comments, as in: “this reminds me of a passage in this other song at [[Song^{timestamp}]]”. This is because of an Obsidian limitation. Since I’m sure there’s a feature request open for it, it might be supported in the future. I really hope so!
Let me know your thoughts! If you have any feedback on the plugin, I’m all ears 
CT