The Piano Sonata, WoO 51, in C major (also called the Sonatina in C major), is an incomplete composition for piano by Ludwig van Beethoven, believed to have been composed before he left Bonn, that was discovered amongst Beethoven's papers following his death. The composition was not published until 1830 by F. P. Dunst in Frankfurt, with a dedication to Eleonore von Breuning, along with the piano trios WoO 38 and WoO 39.[1]