Sérénade, for chamber ensemble in E flat major, op. 15

Camille Saint-Saëns' Serenade in E♭ major, Op. 15 (French: Sérénade en mi bémol majeur) is a chamber composition for a quartet consisting of piano, organ, violin and viola (or cello), composed in 1865. The serenade is one of the earliest works by the composer to make use of an organ (or harmonium) in a chamber ensemble, preceded only by the Six Duos for harmonium and piano, Op. 8. In addition to the original scoring, the work has been transcribed for orchestra, piano solo, piano four-hands, and for piano quartet, with a cello taking the part of the organ.