private async void GenerateObservPlayList() {
            try {
                IEnumerator<Track> plays = party.PlayList.GetEnumerator();
                while (await Task.Factory.StartNew(() => plays.MoveNext())) {
                    string url = plays.Current.URL;
                    bool youtube = url.Contains("youtu");
                    if (youtube) {
                        int index = url.IndexOf("=");
                        string youtubeId = url.Substring(index + 1, (url.Length - index - 1));
                        var youtubeurl = await YouTube.GetVideoUriAsync(youtubeId, YouTubeQuality.Quality480P);
                        plays.Current.URL = youtubeurl.Uri.ToString();
                    }
                    Playlist.Add(new TrackVM(plays.Current));
                }
            }