You can pick from all of our Soundtracks and Playlists within the app (version 34) without having to view Discover Music in a browser.
To access the Discover Music section from the now playing screen, click the down arrow in the top left corner. Then pick the Soundtrack or Playlist you want to play.
If you want to disable the Discover Music feature from the application and only have the content saved to Your Music available, you can do so under the account settings.
Right now this feature is only available on the iOS app. We’re working hard on updating the app for Android and hope to release it soon.