Brass instrument an organ or a choir. Brass instrument A brass instrument is a musical instrument that produces sound by sympathetic vibration of air in a tubular resonator in sympathy with the vibration of the player's lips. Brass instruments are also called "labrosones", literally meaning "lip-vibrated instruments". There are several factors involved in producing different pitches on a brass instrument. Slides, valves, crooks (though they are rarely used today), or keys are used to change vibratory length of tubing, thus changing the available harmonic series, while the player's embouchure, lip tension and air flow serve to select the specific harmonic produced from
Cornett to be a difficult instrument to play—it requires a lot of practice. It embodies a design that survives today in the Russian Vladimir horn or rozhok. The main tube has only the length of a typical woodwind, but the mouthpiece is of the brass type, relying on a combination of the player's lips and the alteration of the length of the sound column via the opening and closing of the finger holes to alter the pitch of the musical sound. Most modern brass instruments are considerably longer than the cornett, which permits the use of harmonics, the sound being altered