A brassinstrument is a musical instrument that produces sound by sympathetic vibration of air in a tubular resonator in sympathy with the vibration of the player's lips. Brassinstruments are also called labrosones, literally meaning " lip -vibrated instruments".
There are several factors involved in producing different pitches on a brassinstrument. Slides, valves, crooks (though they are rarely used today), or keys are used to change vibratory length of tubing, thus changing the available harmonic series, while the player's embouchure, lip tension and air flow serve to select the specific harmonic produced from the available series.
The view of most scholars (see organology) is that the term " brassinstrument" should be defined by the way the sound is made, as above, and not by whether the instrument is actually made of brass. Thus one finds brassinstruments made of wood, like the alphorn, the cornett, the serpent and the didgeridoo, while some woodwind instruments are made of brass, like the saxophone.
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