Franz Schubert wrote three string trios, all of them in the key of B-flat major. From the first of these, D 111A, a trio Schubert wrote in 1814, only a few measures are extant.[1] The string trio D 471 consists of a completed first movement and an incomplete second movement, composed in 1816.[2] The last of these trios, D 581, was completed in four movements, exists in two versions and was composed in 1817.[3]