The French horn is a brass instrument made of tubing wrapped into a coil with a flared bell. The double horn in F/B♭ is the horn most often used by players in professional orchestras and bands, although the descant and triple horn have become increasingly popular. A musician who plays a horn is known as a horn player or hornist. Pitch is controlled through the combination of the following factors: speed of air through the instrument ; diameter and tension of lip aperture in the mouthpiece; plus, in a modern horn, the operation of valves by the left hand, which route the air into extra sections of tubing.
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