[Ch10c] Year is just as good as BPM

  // PRIMITIVE STREAMS

  @Test

  void shouldQueryForBpm() {

  void shouldQueryForYear() {

    List<Song> allSongs = songs.getSongs();

    // adding distinct changes this

    IntSummaryStatistics result = allSongs.stream()

                                                        .mapToInt(Song::getBpm)

                                          .mapToInt(Song::getYear)

                                          .sorted()

                                          .summaryStatistics();