- Source: Op. 9
- Level 1 dakedo Unique Skill de Saikyō desu
- Co-op City, Bronx
- Gerakan Mahasiswa Kristen Indonesia
- Frédéric Chopin
- La cetra
- Op, Nunkolo, Timor Tengah Selatan
- United States of Eurasia
- Dedy Tri Riyadi
- Story Op.2
- Il cimento dell'armonia e dell'inventione
- Op. 9
- Nocturnes, Op. 9 (Chopin)
- List of compositions by Fanny Mendelssohn
- String Trios, Op. 9 (Beethoven)
- Carnaval (Schumann)
- Leo (singer)
- 12 Concerti a cinque (Albinoni)
- Étude Op. 25, No. 9 (Chopin)
- Nocturnes (Chopin)
- Étude Op. 10, No. 9 (Chopin)
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