Editing French horn (section)

===Natural horn===
[[File:Natural Horn (instrument).JPG|left|thumb|A natural horn has no valves, but can be tuned to a different key by inserting different tubing, as during a rest period.]]
{{Main|Natural horn}}
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]]'' and sections of [[Paul Dukas]]' ''[[Villanelle]] for Horn and Piano''), today it is played primarily as a [[Historically informed performance|period instrument]]. The natural horn can only play from a single [[Harmonic series (music)|harmonic series]] at a time because there is only one length of tubing available to the horn player. A proficient player can indeed alter the pitch by partially or fully [[Hand-stopping|muting the bell with the right hand]], thus enabling the player to reach some notes that are not part of the instrument's natural harmonic series – of course this technique also affects the quality of the tone. The player has a choice of key by using crooks to change the length of tubing.<ref>{{Cite book|title=Musical instruments of the world|last=Diagram Group.|date=1976|publisher=Published for Unicef by Facts On File|isbn=0871963205|pages=68|oclc=223164947}}</ref>{{Verify source|date=June 2019}}<!--It seems unlikely that a book of this nature would mention everything in this paragraph (especially Ligeti's use of the instrument).-->