The first screen you'll see when launching the Spotify Mobile app is the Playlist tab. Here, Premium account holders will be able stream their starred tracks and playlists, including tracks that have been sent to you by friends. Upon diving into a playlist you can elect to have its content cached into device memory for offline playback.
The song playback view offers an uncluttered view of album art, along with basic track controls across the bottom, an info button at the top left, and a hide button on the top right that will take you back to your previous screen.
By tapping on the album art or info button in the track playback view, you can access artist and album information, add the track to a playlist, star the track, share it, or adjust shuffle and repeat settings.