Op. 12

In music, Op. 12 stands for Opus number 12. Compositions that are assigned this number include:
 * Adès – Arcadiana
 * Barber – Essay for Orchestra
 * Beethoven – Violin Sonata No. 1
 * Beethoven – Violin Sonata No. 2
 * Beethoven – Violin Sonata No. 3
 * Braunfels – Prinzessin Brambilla
 * Dvořák – String Quartet No. 6
 * Elgar – Salut d'Amour
 * Korngold – Die tote Stadt
 * Larsson – Little Serenade (Liten serenad), suite for strings (1934)
 * Luigini – Ballet égyptien
 * Mendelssohn – String Quartet No. 1
 * Mendelssohn – String Quartets
 * Nielsen – Hymnus amoris
 * Pierné – Piano Concerto
 * Rachmaninoff – Caprice bohémien
 * Saint-Saëns – Oratorio de Noël
 * Schumann – Fantasiestücke, Op. 12
 * Sibelius – Piano Sonata in F major (1893)
 * Vivaldi – Six Violin Concertos, Op. 12
 * Ysaÿe – Poème élégiaque in D minor, Op.12