The BB♭ tuba is a brass instrument known for its deep, rich sound. It is the largest member of the tuba family and is commonly used in orchestras, concert bands, and brass ensembles. The instrument is pitched in BB♭, meaning it sounds two steps lower than written music. Typically made of brass, the BB♭ tuba has a wide bell and a long tubing that contributes to its distinctive tone. Players use a mouthpiece to produce sound by buzzing their lips. This instrument is essential for providing bass lines and harmonies in various musical settings, including classical and marching music.