Op. 91

In music, Op. 91 stands for Opus number 91. Compositions that are assigned this number include:


 * Beethoven – Wellington's Victory
 * Brahms – Two Songs for Voice, Viola and Piano
 * Britten – Sacred and Profane
 * Delius – Two Songs to be sung of a summer night on the water
 * Dvořák – In Nature's Realm
 * Glière – Horn Concerto
 * Margola – Cello Concerto
 * Schumann – Romanzen volume II (6 partsongs for women's voices)
 * Sibelius – Jäger March (Jääkärimarssi), military march for male choir and orchestra (1917)