Sonata for 2 Pianos and 2 Percussion, BB115, Sz.110

The Sonata for Two Pianos and Percussion, Sz. 110, BB 115, is a musical piece written by Hungarian composer Béla Bartók in 1937. The sonata was premiered by Bartók and his second wife, Ditta Pásztory-Bartók, with the percussionists Fritz Schiesser and Philipp Rühlig at the International Society for Contemporary Music (ISCM) anniversary concert of 16 January 1938 in Basel, Switzerland, where it received enthusiastic reviews. Bartók and his wife also played the piano parts for the American premiere which took place in New York City's Town Hall in 1940 with the percussionists Saul Goodman and Henry Deneke. It has since become one of Bartók's most performed works.