Brahms wrote a great deal of vocal music. The greatest of these works is the "German Requiem". There were many works for choirs, and a large collection of songs with piano accompaniment (Lieder). He wrote a lot of piano music which includes sonatas and many shorter pieces such as fantasias, rhapsodies, ballades, intermezzos, capriccios and romances. His chamber music includes string quartets, quintets and sextets and piano trios, quartets and a piano quintet. He wrote four symphonies and four concertos: two for piano, one for the violin and one for violin and cello (the "Double Concerto"). The "German Requiem" is his greatest vocal work.