French Horn

The horn is a brass instrument made of about 12–13 feet (3.7–4.0 m) of tubing wrapped into a coil with a flared bell. A musician who plays the horn is called a hornplayer (or less frequently, a hornist). In informal use, "horn" refers to nearly any wind instrument with a flared exit for the sound.[2]
Descended from thenatural horn, the instrument is often informally known as the French horn. However, this is technically incorrect since the instrument is not French in origin, but German.Therefore, the International Horn Society has recommended since 1971 that the instrument be simply called the horn.[3] French horn is still the most commonly usedname for the instrument in the United States.
Pitch is controlled through the adjustment of lip tension in the mouthpiece and the operation of valves by the lefthand, which route the air into extra tubing. Most horns have lever-operated rotary valves, but some like the Vienna horn use piston valves (similar to trumpet's). Ahorn without valves is known as a natural horn, changing pitch along the natural harmonics of the instrument (similar to a bugle).
Three valves control the flow of airin the single horn, which is tuned to F or less commonly B♭. The more common double horn has a fourth valve, usually operated by the thumb, which routes the air toone set of tubing tuned to F or another tuned to B♭. Triple horns with five valves are also made, tuned in F, B♭, and a descant E♭ or F. Also common are descantdoubles, which typically provide B♭ and Alto F branches. This configuration provides a high-range horn while avoiding the additional complexity and weight of a triple.