 The natural horn is the ancestor of the modern horn.It is essentially descended from hunting horns, with its pitch controlled by air speed, aperture (opening of the lips through which air passes) and the use of the right hand moving around, as well as in and out of the bell.Although a few recent composers have written specifically for the natural horn (e.g., György Ligeti's "Hamburg Concerto"), today it is played primarily as a period instrument.