Shazam is great for discovering new music and settling a friendly bet. While you could already listen to full-length songs from Rdio or Spotify inside the app, now you can add identified tunes to your playlists parked at those two streaming services, too. Without leaving Shazam, simply hit the plus in the top right corner of the screen after the app gives you the track details. Shazam will then display a list of saved playlists for you to choose from. Once you make a selection, you're directed back to the song page in the music discovery app. I gave it a shot this afternoon and it works well, especially if you want to put a song somewhere other than the playlist that Shazam automatically creates, and continually populates, for songs after you link your streaming subscription.