The String Quartet, Op. 3, by Alban Berg was composed in 1910. It was not published until 1920.
The two-movement quartet is among Berg's most original compositions. Reminiscent of Schoenberg's F# minor quartet, the sound owes more to Romanticism than to contemporary composers like Webern.
Along with the composer's Piano Sonata, it received its premiere on 24 April 1911 at the Vienna Musikverein.
References
String Quartet (Berg) Wikipedia(Text) CC BY-SA