Two Components of Sound: The smallest component of music is a note. A note is a single sound produced by an instrument. Melody is music that you can sing along or whistle. This is a melody.
Sound is a form of energy produced by vibrations. When an object vibrates, the air molecules around it move. This molecule vibrates when it collides with a neighboring molecule. This causes them to collide with closer air molecules. In physics, sound is vibrations that propagate as sound waves through a transmission medium such as a gas, liquid, or solid.
In human physiology and psychology, sound is the reception of these waves and what the brain perceives. Sound sources can be divided into two types: natural and artificial. Examples of natural resources include animals, wind, flowing streams, avalanches, and volcanoes. Examples of artificial sources include airplanes, helicopters, vehicles, trains, explosions, factories, and household appliances such as vacuum cleaners and fans.
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