Has anyone looked into or is busy with creating a skill to control Mopidy? This way it would be possible to have Mycroft play music for you. Unfortunately I have no experience in programming in Python, else I would have used the jasper-client as a basis and tried something myself.
In the Jasper code I see that they have an MPD integration to enable Spotify https://github.com/jasperproject/jasper-client/blob/master/client/modules/MPDControl.py It would be neat to have mpd running locally on the same hardware as Mycroft and use Mycroft as the interface to select and play music, from Spotify or a different source.