Symphony (Webern)

Symphony, Op. 21
Symphony by Anton Webern
Incipit with labeled tone rows
Opus21
Perioddie Neue Musik (20th-century music)
LanguageGerman
Composed1927–1928
DedicationWebern's youngest daughter Christine Mattl (née Webern)
Duration10–20 minutes
MovementsI. Ruhig schreitend
II. Variationen
Scoring1 clarinet
1 bass clarinet
2 horns
1 harp
strings without basses
Premiere
Date18 December 1929 (1929-12-18) (world premiere)
LocationTown Hall, New York
ConductorAlexander Smallens
PerformersOrchestra of the League of Composers

Symphony, Op. 21 was composed by Anton Webern between 1927 and 1928. It was his first twelve-tone orchestral work. The two-movement work lasts 10–20 minutes and is full of Alpine topics, abstraction, and intricate musical form, including some fixed register. The Symphony was influenced by Gustav Mahler. Alexander Smallens conducted the world premiere at New York's Town Hall on 18 December 1929.