The horn is a brass instrument consisting of about 12 feet of tubing wrapped into a coil with a flared bell. It is descended from the natural horn and is informally known as the French horn.
Horns have valves, operated with the left hand, to route the air into extra tubing to change the pitch. Most horns have lever-operated rotary valves, but some horns like the Vienna horn use piston valves. A horn without valves is known as a natural horn, changing pitch along the natural harmonics of the instrument but with a wide range of notes due to the long tubing.
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