In music, Op. 4 stands for Opus number 4. Compositions that are assigned this number include:
Beethoven – String Quintet, Op. 4 Berg – Altenberg Lieder Bliss – String Quartet in A major Brahms – Scherzo Britten – Simple Symphony Chopin – Piano Sonata No. 1 David – Trombone Concertino Dommayer – Gunstwerber Dvořák – Symphony No. 2 Elgar – Idylle G. English – Symphony No. 1 Handel – Organ concertos, Op. 4 Madetoja – Elegia, for strings (1910) Mielck – Symphony in F minor (1897, revised 1898) Mendelssohn – Violin Sonata in F minor Reger – Sechs Lieder, Op. 4 Schoenberg – Verklärte Nacht Schumann – Intermezzi Schütz – Cantiones sacrae Sibelius – String Quartet in B-flat major (1890) Strauss – Kettenbrücke-Walzer Stravinsky – Feu d'artifice Vivaldi – La stravaganza Wieniawski – Polonaise de Concert, Op. 4 Zandonai – Francesca da Rimini