I've downloaded few mixes with relaxing music from YT and created a playlist in my foobar, it's simple and it doesn't require browser. I also recommend some radio streams:
soundcloud can be good, once it knows your preferences, but to much random stuff and volume changes happen that i switched back to di now. di has a treasure shows now for each genre which basically what i used to use SC for so im set.
https://somafm.com
http://echoesofbluemars.org/
https://plaza.one/