title: iOS - Any way to get another app's now playing song info
body: <p>5 years ago there was the same question where everybody answered 
  "No, you can't, it's iOS sandbox", in general, then it was a iOS 5, 
  but now is 2016 and iOS 9.3 is coming up and the same question: <br><br>
  My app need to know information (tittle, artist, album) about now playing song in system, that means it need to support any player like built-in Apple Music or Spotify, Bandcamp and more. I tried to access by <code>MPMusicPlayerController.nowplayingitem</code>, but it works only with Apple Music app, I tried to call <code>MPNowPlayingInfoCenter</code>, and as I understand, it just let me set some info to Control Centre and lock screen if your app is nowPlaying in iOS, but if not, it returns <code>nil</code>.<br> Is there any way to do this? <em>Swift answers welcome</em></p>