Hit that subscribe button
Select between song and video mode:
Learn more here. With a YouTube Music Premium membership, you can choose whether to listen to your music or enjoy the music video experience with a YouTube Music Premium membership. In song mode, you can listen to the music without loading a video. This allows you to continuously enjoy music from your favorite artists, even if you're experiencing low connectivity or video playback issues. In video mode, the music video will play whenever one is available - allowing you to enjoy a complete listening and viewing experience. You'll see the option to select Song or Video mode at the top of the screen. Tap Video to turn on video mode.
Stream Songs and play videos
A new music streaming service from YouTube This is a completely reimagined music service with official releases from your favorite artists. Just search the lyrics or describe it. If you subscribe via iTunes: Payment will be charged to iTunes Account at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. Account will be charged for renewal within 24 hours prior to the end of the current period at the rate of the selected plan.
Google's latest endeavor into streaming music services has a slight learning curve, only because it takes some inspiration from YouTube in how it handles your music. When you first start service, you're asked to pick some artists you like. Those selections are important because they direct listening suggestions made by YouTube Music. When you subscribe to an artist, you can find him or her in the Artists section of your library. After your initial selection of artists you like, you can continue to fine tune the app's suggestions with a thumbs up or down on an album or song.