Here is a step-by-step explanation of how a brass instrument makes its sound:
* The musician places their lips on the mouthpiece of the instrument and blows air into it.
* The air flows through the mouthpiece and causes the musician's lips to vibrate. This vibration creates sound waves.
* The sound waves travel through the instrument and are amplified by the bell.
* The length of the instrument and the amount of air pressure used determine the pitch of the sound.
* The musician can change the pitch of the sound by moving their lips closer or further from the mouthpiece, or by using more or less air pressure.
The sound produced by a brass instrument is warm and mellow, and can be used to create a wide variety of music, from classical to jazz to rock.