...
DLNA/UpnP is an out-of-the-box option to stream music in hi-res from an external source, using Volumio device as renderer.
ONLY FOR PREMIUM USERS:
You can add your own account of Tidal/Qobuz/Hires Audio Hiresaudio.com streaming platforms
You can connect an external digital source via USB port (such digital turntable or CD drive)
You can stream a Bluetooth source
Finally many For everyone: Many 3rd party plugins such Spotify, Soundcloud, Youtube and many more are available for free in PLUGIN the PLUGINS section.