// are 'collected', and some are 'favorited'.
ImmutableSet<Song> library = ImmutableSet.copyOf(user.library().get());
bus.post(new GetSongsToSyncProgressChangedEvent(this, 2, 3));
ImmutableSet<Song> favorites = ImmutableSet.copyOf(user.favorites().get());
SetView<Song> nonFavorites = Sets.difference(library, favorites);
SetView<Song> all = Sets.union(nonFavorites, favorites);
bus.post(new GetSongsToSyncProgressChangedEvent(this, 3, 3));