You can really feel this if you press down valves 1,2 and then try and bend the notes up to the highest note. Once your lips match a supported frequency, then the trumpet resonates. The trumpet is essentially a long tube that can be changed in length by pressing combinations of the valve keys. If you have a trumpet with no keys pressed down, you get a bugle. A bugle is a fixed length and is only meant to resonate at a few frequencies. If you pick up a piece of PVC at the hardware store and try to buzz into it… which is only something you’d ever see a brass player do because they are all kind of crazy, you’ll notice that you can only play a few notes and the notes have pretty big gaps in between them.
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