Horn trio
Horn trio can mean a work written for three natural horns or French horns as well as one for horn and two other instruments. In the latter category, an important genre is the trio for horn, violin and piano. Although there are a few earlier examples, the tradition of this scoring was inaugurated in 1865 by Johannes Brahms with his Trio in E, opus 40. Related combinations are those of oboe, horn, and piano, clarinet, horn, and piano, horn, bassoon, and piano and flute, horn, and piano.