public Tracks getTracks(final UserId userId) {
   return baseService.get(PREFIX_USER, userId.getId(), "tracks", Tracks.class);
 }
 public Playlists getPlaylists(final UserId userId) {
   return baseService.get(PREFIX_USER, userId.getId(), "playlists", Playlists.class);
 }
 public Radio getRadios(final UserId userId) {
   return baseService.get(PREFIX_USER, userId.getId(), "radios", Radio.class);
 }
 public Followers getFollowers(final UserId userId) {
   return baseService.get(PREFIX_USER, userId.getId(), "followers", Followers.class);
 }
 public Charts getCharts(final UserId userId) {
   return baseService.get(PREFIX_USER, userId.getId(), "charts", Charts.class);
 }
 public Artists getArtists(final UserId userId) {
   return baseService.get(PREFIX_USER, userId.getId(), "artists", Artists.class);
 }
 public Albums getAlbums(final UserId userId) {
   return baseService.get(PREFIX_USER, userId.getId(), "albums", Albums.class);
 }
 public User get(final UserId userId) {
   return baseService.get(PREFIX_USER, userId.getId(), User.class);
 }