public IObservable <BitmapImage> FetchImageForAlbum(Song song)
{
var rq = new RestRequest(String.Format("images/art/{0}.png", song.id));
var fullUrl = client.BuildUri(rq).ToString();
this.Log().Info("Fetching URL for image: {0}", fullUrl);
return(cache.LoadImageFromUrl(fullUrl));
}