So there is a github repo that is meant to be used with a bunch of different music providers and allows you to use the media keys on a mac to control a webpage. It used to work with Subsonic 5 but with the latest it looks like there has been some breaking changes with respect to the javascript. I am thinking it would be fairly trivial for a person in the know to make an update to the subsonic implementation for beardedspice. I am going to keep looking for a way to do it myself but in case someone sees this and thinks it easy or can point me to a place where I can see documentation on the frontend page for subsonic, that would be great.
Github project: https://github.com/beardedspice/beardedspice
The particular "Media Strategy" in question: https://github.com/beardedspice/bearded ... ubsonic.js
I will update this with anything I find.