The second movement of the Berlioz Requiem is the "Dies Irae" - Berlioz takes a quite different approach to this iconic text than Mozart or Verdi. Beginning quietly with a unison theme in the basses and cellos, he continues to present new themes layered on top of the old ones until a shattering climax is reach for the "Tuba mirum" - the sound of the trumpet at the day of judgment.