Op. 1

In music, Op. 1 stands for Opus number 1. Compositions that are assigned this number include:

• Bach – Partita for keyboard No. 4
• Bartók – Rhapsody
• Beethoven – Piano Trios, Op. 1
• Berg – Piano Sonata
• Brahms – Piano Sonata No. 1
• Chopin – Rondo in C minor
• Clara Schumann – 4 Polonaises
• Clifford – Symphony in E-flat
• Dvořák – String Quintet No. 1 in A minor
• Elgar – Romance for violin
• Goeyvaerts – Sonata for Two Pianos
• Mendelssohn – Piano Quartet No. 1
• Michael Haydn – Symphony No. 27
• Michael Haydn – Symphony No. 28
• Michael Haydn – Symphony No. 29
• Mozart – Violin Sonata No. 18
• Mozart – Violin Sonata No. 19
• Mozart – Violin Sonata No. 20
• Prokofiev – Piano Sonata No. 1
• Rachmaninoff – Piano Concerto No. 1
• Schubert – Erlkönig
• Schumann – Variations on the name "Abegg"
• Sibelius – Five Christmas songs
• Stamitz – Trios, Op. 1
• Strauss – Sinngedichte
• Strauss – Täuberln-Walzer
• Stravinsky – Symphony in E-flat
• Sullivan – The Tempest
• Tchaikovsky – Scherzo à la russe
• Turina – Piano Quintet
• Vivaldi – Twelve Trio Sonatas, Op. 1
• Waterhouse – String Sextet
• Webern – Passacaglia for orchestra