Alban Berg's Piano sonata (Klaviersonate), Op. 1, was published in 1910, but the exact date of composition is unknown; sources suggest that it was written in 1909. The Sonata is Berg's only piano work to which he gave an opus number.
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History

Berg first studied under Arnold Schoenberg in the autumn of 1904, taking lessons in harmony and counterpoint. Later, in autumn 1907, he returned to begin studies in composition, which ended with the study of sonata movements. Several draft sketches of sonata movements date from this period and it is thought that Op. 1 followed from these drafts. The exact date of composition is unknown; although the second reissue of the score bears the date 1908, sources suggest that the Sonata was not composed until the spring or summer of 1909 (Scheideler, 2006). The premiere of the Piano Sonata, Op. 1 was given in Vienna on 24 April 1911 by Etta Werndorff. Other works by Berg and Anton Webern were also played at that concert. Pianist Léo-Pol Mori