ScreenSleeves Pro Detects which is playing and displays cover art and details for the currently-playing track with a choice of themes. Can fetch artwork from the web if needed. The Pro version has all the features of the free version and adds option to display details for music playing on another Mac, display bitrate, sample rate, file kind (all themes but currently iTunes only). Further themes planned! Support for iTunes, iTunes internet streams, Swinsian, Spotify, Snowtape, Ecoute, Rdio, Radium and Hermes (Pandora client). Screensleeves detects which is playing.