AEROPHONES
AEROPHONES
Instruments in which the main vibrating material is air itself, forced into a closed or open container, which separates a portion of it from the environment or freely dispersed into the environment, are defined as AEROPHONES. The last example is the case of RATTLES which cut through the air with a circular movement and produce a series of sonorous vortices and hisses. In wind instruments in the strict sense of the word, there is generally an external impulse (almost always the breath of the player) as the cause of the variation of pressure on which the generation of the sound depends. The formation of notes of different heights depends, in wind instruments, on the length of the column of vibrating air, generally determined by the presence of one or more holes in the instrument, This category includes: WHISTLES, REEDS, FLUTES that can be straight, transverse, with or without holes; OBOES, CLARINETS, TRUMPETS, whether shells or tubular trumpets, with or without a mouthpiece, with holes or pistons.