In music, Op. 13 stands for Opus number 13. Compositions that are assigned this number include:
Bartók – The Wooden Prince Beethoven – Piano Sonata No. 8 Britten – Piano Concerto Dvořák – Symphony No. 4 Enescu – Symphony No. 1 Fauré – Violin Sonata No. 1 Glazunov – Stenka Razin Kodály – Psalmus Hungaricus Mendelssohn – String Quartet No. 2 Nielsen – String Quartet No. 1 Rachmaninoff – Symphony No. 1 Schumann – Symphonic Studies Sibelius – Seven Runeberg Songs, collection of art songs (1891–1892) Strauss – Piano Quartet Tchaikovsky – Symphony No. 1