private async void _updateTimer_Tick(object sender, object e)
 {
     StorageItemsUpdated.Invoke(
         MusicLibrary.ChangeTracker,
         new StorageItemsUpdatedEventArgs(
             await MusicLibrary.ChangeTracker.GetChangeReader().ReadBatchAsync()));
 }
 private async void QueryResult_ContentsChanged(IStorageQueryResultBase sender, object args)
 {
     StorageItemsUpdated.Invoke(
         MusicLibrary.ChangeTracker,
         new StorageItemsUpdatedEventArgs(
             await MusicLibrary.ChangeTracker.GetChangeReader().ReadBatchAsync()));
 }