Among the sacred works by Saint-Saëns there are just two settings of the mass: the Messe de Requiem op. 54 from his middle period (1878), and the Mass op. 4 dating from 1856. This was first performed on 21 April 1857.
As an alternative to the original version with large orchestra and Grand Orgue, Carus-Verlag is now publishing the version for organ made by Saint-Saëns’s contemporary Léon Roques. It contains the original part for grand orgue as well as an organ arrangement of the orchestral writing in score notation, but also provides for the possibility of a performance with just one instrument. The vocal parts (for soloists and choir) are identical with the edition of the original version, so that the vocal score and chorus score of that version can be used.