A brass instrument is a musical instrument also known as a labrosone, which literally means ‘lip-vibrated instruments’! The trumpet, trombone, tuba, cornet and the French horn are all examples of brass instruments.
Brass players vibrate their lips very quickly on the mouthpiece of the instrument. This causes vibrations in the air inside the instrument, forming sound waves. The brass player can then vary the amount of air inside the instrument to create different notes. On a trombone, this is done through a part called the slide, which makes the tube of air vibrating either longer or shorter.