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As part of Google's big YouTube Red push, it has released a new YouTube app called YouTube Music. This was promised a few weeks ago when Red was announced, and now it's here. In the same way YouTube Gaming is an app focused on gaming videos on YouTube, the YouTube Music app is focused on music on YouTube. What the app can do for you is dependent on whether or not you have a subscription to Red/Play Music.
The main advantage to using YouTube as a source of music is that there's a lot of unusual stuff on there. You get all the usual albums and whatnot you will find on other services, but there's also a wealth of remixes, live concerts, covers, and so on. This is why a lot of people just use the YouTube website for their music needs in the first place. The app makes this easier by surfacing only music and music videos. The home tab lists things that you might be interested in based on what you've listened to in Google's ecosystem in the past. The next tab over shows you all the hottest music on YouTube, then there's a tab of all your liked music videos.
When you're listening to your recommended music, there's a cool feature on the Now Playing screen that lets you determine how much variety you want in the station. More variety means Google ventures further from the taste profile it has built for you, and less means that it will mostly show you things you've liked in the past.
All the above is available to all users of YouTube Music. If you've got a Red or Play Music subscription (both services are included for the $10 price), you get some cool bonuses. First and foremost, you can do background and screen-off audio streaming. If you leave YouTube Music or shut off the screen, the app will automatically switch to audio streaming mode and keep going. You even get playback controls in the notifications like a standard music app. There's a persistent toggle at the top of the screen to switch between video and audio-only mode too.
Premium users can also cache music offline with a feature called Offline Mixtape. This isn't quite the same as the Play Music offline feature where you explicitly save tracks you want. Instead, YouTube Music grabs a set amount of music that it thinks you'll like based on your past behavior. The default setting for this is 80MB or about 20 tracks. The only semblance of manual control I can find here is that it does include your most recently liked videos. It's kind of a neat feature for offline listening.
Perhaps most important here is that YouTube Music is ad-free for subscribers. Everyone else gets regular YouTube-style ads. They might not be on every video, but they're going to be there. Honestly, Google's $10 deal with Play Music streaming, YouTube Red, and now YouTube Music is such a fantastic deal, I can't think of a good argument against it.