Best answer by MikeV
Free radio services do work with Sonos though, as they don't use the Sonos queue and can put ads between songs without you being able to skip them. Pandora, Slacker, AccuRadio, iHeartRadio, and a whole variety of radio stations - some traditional, some internet-only - through TuneIn are available. Other services may also be available in other countries.
Youtube Music isn't supported by Sonos, however if you subscribe to Youtube Red, Google Play Music (which is included with the Youtube Red service) can be used through Sonos.