title: Programatically get the name and artist of the currently playing track in Swift
body: <p>I have tried the following:</p>
  
  <pre><code>let nowPlaying = MPNowPlayingInfoCenter.defaultCenter().nowPlayingInfo
  </code></pre>
  
  <p>However I get back <code>nil</code> everytime I run it with a song playing.</p>
  
  <p>I would like to be able to grab the track title and artist and display it in my app.</p>