code: public List<Playback> getPathPlaybacks(String path) {
      ImmutableList.Builder<Playback> playbacks = ImmutableList.builder();
      for (Playback playback : playedSounds) {
        if (idIsForPath(playback.soundId, path)) {
          playbacks.add(playback);
        }
      }
      return playbacks.build();
    }
docs: Return a list of calls to {@code play} made for the given path.