Schubert wrote a great deal of chamber music. Among his most famous pieces are several string quartets, a string quintet (for 2 violins, viola and 2 cellos) and the “Trout” quintet (for piano, violin, viola, cello and double bass). There are sonatas and sonatinas for violin and piano, and a sonata for an instrument called the “arpeggione” which was used for about ten years after it was invented and then it was forgotten. The sonata is normally played on a cello or a viola nowadays. There is lots of piano music including sonatas, impromptus and also piano duet music. Schubert wrote eight famous impromptus.