This is composed of mechanical sounds having rhythm melody or harmony
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vocal or instrumental sounds (or both) combined in such a way as to produce beauty of form, harmony, and expression of emotion.
Explanation:
Sound is a longitudinal wave, which means the particles of the medium vibrate parallel to the direction of propagation of the wave. A sound wave coming out of a musical instrument, loudspeaker, or someone's mouth pushes the air forward and backward as the sound propagates outward. This has the effect of squeezing and pulling on the air, changing its pressure only slightly.
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