https://www.theverge.com/2019/1/30/18204000/youtube-music-premium-sonos-speakers-app

YouTube has announced that, starting today, YouTube Music is now available within the Sonos app and can be played on all Sonos speakers. Users with a YouTube Music Premium or YouTube Premium subscription will be able to stream albums, remixes, covers, playlists, and more to their Sonos speakers.

Some of the features included in YouTube Music on the Sonos app are recommendations based on a user’s listening history, mood-based playlists (like Energy Boosters and Throwback Jams), and Top 100 Songs charts, an app feature which received a lukewarm reception. There’s also a new releases section, personalized playlists, and your library, which keeps track of everything you’ve saved.