In music, Op. 9 stands for Opus number 9. Compositions that are assigned this number include:

• Adams – Chamber Symphony
• Adès – Living Toys
• Bartók – Four Dirges
• Beethoven – String Trios, Op. 9
• Chopin – Nocturnes, Op. 9
• Dohnányi – Symphony No. 1
• Kabalevsky – Piano Concerto No. 1
• Larsson – The Princess of Cyprus (Prinsessan av Cypern), opera in four acts (1936)
• Rachmaninoff – Trio élégiaque No. 2
• Schumann – Carnaval
• Sibelius – En saga, tone poem for orchestra (1892, revised 1902)
• Sor – Introduction and Variations on a Theme by Mozart
• Strauss – Seufzer-Galopp
• Vivaldi – La cetra

Topics referred to by the same term

This disambiguation page lists compositions catalogued to the same opus number.
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