A brass instrument is a musical instrument whose tone is produced by vibration of the lips as the player blows into a tubular resonator. They are also called labrosones, literally meaning "lip-vibrated instruments".
There are two factors in changing the pitch on a valved brass instrument: pressing the valves to change the length of the tubing, and changing the player's lip aperture or "embouchure", which determines the frequency of the vibration into the instrument.
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