WORK IN PROGRESS
A local HTTP server built to run on your home network with node that exposes Chromecast functionality. As an interesting side effect of this you can Cast from ouside of your home network (using port forwording) and do some pretty cool other stuff.
In order to use Google Music you need to get a key first. If you use 2-Factor Authentication (which you absolutly should) then you'll need to set up a temporary App Password
Once you set that up, fill out login.js with your info and then run it with
node login.js
If everything works you should get an Android ID and a Master Token which you stick in your config.
That's it, you are ready to go! Run it with
node index.js
When you pause chromecast turn the lights up in the room When you play it again turn the lights down