internal GenreGrouped(IList<IAlbum> albums)
 {
     var Int = albums.LiveToLookUp((al) => al.MainGenre);
     _Coll = Int.LiveOrderBy((g) => g.Key.FullName).LiveSelect(el => new ComposedObservedCollection<IGenre, IAlbum>(el.Key, el.Collection));
     _ToClean = Int;
 }