What are the three main parts of brass instruments?

The three main parts of brass instruments are the mouthpiece, the tubing, and the bell. The mouthpiece is where the musician blows air to create sound, and it shapes the pitch and tone. The tubing, which varies in length and shape, determines the instrument's pitch by allowing air to resonate at different frequencies. The bell, located at the end of the instrument, amplifies and projects the sound produced by the vibrating air column within the tubing.