Not exactly what you want... You can likely run Mopidy on a pi and lauch browser...

		aliher1911 45 days ago \| parent \| context \| favorite \| on: De-Clouding: Music Not exactly what you want... You can likely run Mopidy on a pi and lauch browser in kiosk mode to show its web interface. If you don't want display and ok controlling from your phone then you can run mpd for local files and librespot as spotify speaker.