A brass mute is a device used by brass instrument players to alter the sound of their instrument. It is typically made of metal and fits into the bell of instruments like the trumpet, trombone, or French horn. The mute can create a softer, more subdued tone, making it useful for various musical styles and settings. Brass mutes come in different types, including straight, cup, and harmon mutes, each producing unique sound qualities. Musicians often use them in orchestras, jazz bands, and solo performances to achieve specific effects or to blend better with other instruments.