The Grande Messe des morts (or Requiem), Op. 5, by Hector Berlioz was composed in 1837. The Grande Messe des Morts is one of Berlioz's best-known works, with a tremendous orchestration of woodwind and brass instruments, including four antiphonal offstage brass ensembles. The work derives its text from the traditional Latin Requiem Mass. It has a duration of approximately ninety minutes, although t... Wikipedia