How do you play audio across multiple xaml pages in Windows RT?

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C#

XAML

Win8

I have a Windows Phone application that does this, using this simple method in my App.xaml.cs file:

public void BackgroundMusic()
{
    if ((bool)settings["music"])
    {
        if ((MediaPlayer.GameHasControl) && (MediaPlayer.State != MediaState.Playing))
        {
            Song s = Song.FromUri("BackgroundMusic", new Uri("audio/background.mp3", UriKind.Relative));
            MediaPlayer.IsRepeating = true;
            MediaPlayer.Play(s);
        }
    }
}

This approach does not seem to work in Windows 8. Has anyone identified a simple solution to this problem?