High Quality Content by WIKIPEDIA articles! The horn (also known as the corno and French 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 horn player (or less frequently, a hornist). In informal use, "horn" refers to nearly any wind instrument with a flared exit for the sound.