Emmanuel Chabrier
Emmanuel Chabrier (1841-1894) was a French composer and pianist, however he didnt work as a professional musician until the age of 39. He wrote a number of operas and piano works but is perhaps best known for the orchestral work España.
His Larghetto for horn is also quite well known and a staple of the horn repertoire, and accompaniment tracks for Chabriers Larghetto can be found on this website. A link can be found below.