Hector Berlioz's Requiem is a monumental work. Commissioned to commemorate the soldiers who died in the July Revolution of 1830, it is known for its massive scale. Requiring a large orchestra, multiple choirs, and additional brass ensembles, Berlioz's masterful orchestration showcases the innovative use of instruments with unusual combinations. The Requiem includes the terrifying "Dies Irae" alongside the serene "Sanctus" and remains a cornerstone of choral performance.