A brass instrument is a type of musical instrument made primarily of brass or other metals. These instruments produce sound when the player buzzes their lips into a mouthpiece, creating vibrations that resonate through the instrument's tubing. Common examples include the trumpet, trombone, and tuba. Brass instruments are known for their bright, powerful sound and are often used in orchestras, bands, and jazz ensembles. They can vary in size and shape, affecting their pitch and tone. The use of valves or slides allows players to change notes and create a wide range of musical expressions.