@vancha I don't know if any of the ones listed at https://fckdrm.com/ are built on open-source software, but they don't require clients.
@vancha Yeah. I actually discovered Jamendo through an open-source game that uses music by a band on it.
http://mars-game.sourceforge.net/ (`marsshooter` in the Ubuntu Universe repository)
https://www.jamendo.com/track/337572/ezer-ev
It's sort of like a SoundCloud that doesn't fight tooth and nail to prevent downloading unless the uploader pays money.
@ssokolow hah, seriously? symphonic metal in a game? best combination ever :D