What are the three main parts of brass instruments?

1. Mouthpiece: The mouthpiece is the part of the instrument that the player blows into. It is typically made of brass, and it has a cup-shaped design. The size and shape of the mouthpiece can affect the tone of the instrument.

2. Body: The body of the instrument is the main part of the instrument. It is made of brass, and it has a cylindrical or conical shape. The length of the body can affect the pitch of the instrument.

3. Bell: The bell is the flared end of the instrument. It is made of brass, and it helps to project the sound. The size and shape of the bell can affect the tone of the instrument.