Musical material is made up of sounds, and they are created by the vibration of a body, which thus becomes a source of sound . Sound waves are transmitted through the air in the form of circles from the sound source to our ear. When the vibrations in the air are regular, what we hear is the tone - so the proper, clear sound. When the vibrations are irregular, we hear only noise or noise - sounds mostly more or less unpleasant to the human ear (although they are also used in music).
One vibration source may cause the same vibrations in other objects, but their vibrations must be consistent with the vibrations of the source. This is called resonance . Thus the sound of the human voice is produced not only by the vocal cords but also by resonant vibrations in the cranial cavity . Similarly, the sound box of a musical instrument vibrates resonantly with the initial movement given by the performer to the instrument. For example, the violin box resonates with the vibrations of the violin string and amplifies the tone. The more vibrations per second, the higher the tone. The human ear is extremely sensitive to differences in height and has a range of about 20 to as much as 20,000 vibrations per second. One mixed choirproduces frequencies between approximately 64 and 1500, and a concert piano between 20 and 4176 When a group of musicians play together, they harmonize their instruments with tone A defined by 440 Hz . .
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