Spotify is a music streaming service that is available on PlayStation 4. To use Spotify on PlayStation 4, you must first create an account and sign in. Once you have an account, you can access your music library by clicking on the “Library” button in the top left corner of the main screen. You can also find Spotify on your PlayStation 4 by searching for “Spotify” in the search bar at the top of the main screen. If you are not signed in to your account, you can sign in by clicking on the “Sign In” button at the bottom of the main screen. Once you have signed in, you can access your music library by clicking on one of three buttons: “Music”, “Playlists”, or “Add to Library”. If you are not signed in to your account, then you cannot add songs to your library. To add songs to your library, click on one of three buttons: “Music”, “Playlists”, or “Add to Library”. If you are not signed in to your account, then songs will not be added until after sign-in is successful.