So long as you have either a YouTube Music Premium or YouTube Premium subscription, you can play your entire YouTube Music library through the Sonos Controller app.
If you don't have an account with a streaming music service these days, you simply aren't living your life right.
According to YouTube, you'll be able to listen to recommended suggestions, new releases, top YouTube charts, "Your Mixtape" and your own music library. All of this is kind of a big deal because of YouTube Music's large catalogue and collection of unreleased music that's not usually available on services like Apple Music or Spotify.
Open the Sonos Controller app. For a small monthly fee, you get access to more music than you can possibly listen to in a single lifetime.
The addition of YouTube Music only adds to the wide range of songs, albums, and podcasts available - with a particular focus on live performances, cover tracks, and remixes you won't always get through competing streaming services. So if you are into that, this might be really useful.