title: PHP-Gracenote library doesn't return an album_art_url
body: <p>The demo file from the php-gracenote library doesn't return an <code>album_art_url</code>. "Moby" is the default search query. Even when I change the search query to something else it still doesn't return an <code>album_art_url</code>.</p>
  
  <p>Is the library broken or does Gracenote disable <code>album_art_url</code> in searches?</p>