public Tracks getTracks(final AlbumId albumId) {
   return baseService.get(PREFIX_ALBUM, albumId.getId(), "tracks", Tracks.class);
 }
 public Comments getComments(final AlbumId albumId) {
   return baseService.get(PREFIX_ALBUM, albumId.getId(), "comments", Comments.class);
 }
 public Fans getFans(final AlbumId albumId) {
   return baseService.get(PREFIX_ALBUM, albumId.getId(), "fans", Fans.class);
 }
 public Album get(final AlbumId albumId) {
   return baseService.get(PREFIX_ALBUM, albumId.getId(), Album.class);
 }