People look at brass instruments and wonder how anyone could possibly make a sound on them, they are just a tube. The trick to making a sound on these instruments is all in the lips and any instrument that creates its sound this way is classified as a brass instrument. All the slides and valves are just extra, they are not needed for you to make a basic sound. The way your lips are used on any wind instrument is called the embouchure. This controls the pitch and to some degree the quality of your sound and on a brass instrument you must learn to “buzz”.
To do this certain things must happen.-
The lips must be moist. The surface tension of the water aids in setting up the vibrations.
The lips must be touching. (If the air has nothing to fight there is NO buzz.)
Use as Little pressure as possible. Pressure only separates the lips and stops the sound. Backing off the pressure will allow you to soar.
It is possible to blow air without having the lips buzz, but in order for the lips to buzz, they must remain touching. Say the letter “M”, but when making the silent “P,” blow air and keep the lips pressing together. If air comes out without any buzz, then you need to keep the lips together. If it is very difficult and you feel like your head is going to explode, then your lips are too tight.
Once you can get your lips to buzz, try doing sirens or “roller coasters” where you buzz higher and lower notes going up and down. You will notice that it takes firmer lips and faster air to buzz higher and slightly looser lips and slower air to blow lower.
That is all there is to it. Once you can make a buzz there are all sorts of brass instruments you can start learning…..even the didgeridoo. It does not matter it is made of wood, if you make a sound into it by buzzing, it is part of the brass instrument family too!
Look at this video which clearly demonstrates how to make a sound on any brass