Saint-Saëns (1835-193521) was a French composer best remembered for a few works (Symphony 3, Danse macabre, Carnaval des Animaux). There are many other compositions that deserve attention, such as his concertos and his chamber music. I have chosen his stunning and little known Requiem, for soloists, chorus and orchestra, Op. 54, from 1878. Relevant links below.