In music, Op. 40 stands for Opus number 40. Compositions that are assigned this number include:
Arnold – Symphony No. 2 Barber – Antony and Cleopatra Beethoven – Romance for violin and orchestra no. 1 Op. 40 Brahms – Horn Trio Bruch – Hermione Chopin – Polonaises Op. 40 Dohnányi – Symphony No. 2 Dvořák – Nocturne in B major Elgar – Cockaigne (In London Town) Finzi – Cello Concerto Holberg – Holberg Suite Mendelssohn – Piano Concerto No. 2 Rachmaninoff – Piano Concerto No. 4 Reger – Zwei Choralphantasien, Op. 40 Robbins – The Concert Saint-Saëns – Danse macabre Schumann – 5 Lieder Schwabe – Fervaal Shostakovich – Cello Sonata Strauss – Ein Heldenleben