The horn is a instrument made of tubing wrapped into a coil with a flared bell. The double horn in F/B♭ is the horn most used by professional bands and orchestras. The proper name of the horn is simply the horn, or horn in F. "French Horn" is a colloquial term for the instrument that is not officially recognized in the professional music world. Pitch is controlled through the adjustment of lip tension in the mouthpiece and the operation of valves by the left hand, which route the air into extra tubing. A musician who plays any kind of horn is called a horn player (or less frequently, a hornist).