The Sonata for Two Pianos and Percussion, Sz. 110, BB 115 is a musical piece written by Hungarian composer Béla Bartók in 1937. It was premiered by him 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