A cornet is a brass musical instrument similar to a trumpet but with a more conical shape. It has a warm, mellow tone and is commonly used in concert bands, brass bands, and jazz ensembles. The cornet typically has three valves that allow players to change notes and is often made of brass, sometimes with a silver or gold plating. The cornet is known for its versatility and is often played in various musical styles, including classical, marching, and popular music. Famous cornet players, such as Herb Alpert and Louis Armstrong, have contributed to its popularity and showcase its unique sound in different genres.