It's a solution, but a hastily put together one, it seems. YouTube Music comes to Android TV through a server-side update that introduces a new Music tab in the app with YouTube Music's logo on it. It shows a lot of your regular YouTube recommendations and the content taken from your account. You'll get access to things like "Your likes" and playlists you've subscribed to, "Your mix," "Discover mix," some genre and mood stations, your playlists, artists stations based on your listening habits, and recommended playlists. And it has an instant playback function that starts when you highlight a mix, playlist or artist station.
Beyond that, though, it's basic integration, lacking a lot of features that would be better introduced through a dedicated YouTube Music app. It doesn't offer background playback, shuffle or repeat, audio/video toggle, playlist management, full library access including to your uploaded music, and synchronized lyrics. Here's to hoping Google fixes these lapses and give its subscribers a better app to work with.
Source: Android Police