The tuba is a large brass musical instrument known for its deep, rich sound. It is the lowest-pitched instrument in the brass family and typically has a wide bell and a long coiled tubing. Tubas are commonly used in orchestras, concert bands, and brass ensembles, providing a strong bass foundation for the music. The tuba is played by buzzing the lips into a mouthpiece, which produces sound. Players can change the pitch by pressing valves that alter the length of the tubing. Famous composers like Gustav Mahler and John Williams have written music that features the tuba, showcasing its unique tonal qualities.