sentences:  Brahms also learned natural horn (as well as piano and cello) as a child, which may be another reason why he chose to write for these instruments following the death of his mother.Notwithstanding Brahms's love for the sound of the natural horn, he did specify that the horn part could be played by a celloand it was indeed published with a transposed cello part.Much later in 1884 Brahms also reworked the part for viola.