Because vibrations are sound.
For an object to make sound, it must vibrate. This vibration creates compression waves in the surrounding medium (such as air), which are perceived by our ears as sound. The frequency of the vibration determines the pitch of the sound produced.
Vibration and a medium like air
sound is simply the vibration of air molecules. so, sound occurs whenever air molecules are vibrated. but in order for us as humans to hear that sound, the air molecules have to vibrate within a certain frequency range
Sound is produced through the vibration of an object. This vibration creates sound waves that travel through a medium, such as air, and reach our ears. When these sound waves reach our ears, they are translated into electrical signals that the brain perceives as sound.
it depends on how big or small the vibration is to determine the sound. The bigger the vibration, the lower the sound is. the smaller the vibration, the higher the sound.
An object must be vibrating in order to produce sound. This vibration creates a disturbance in air particles, which travels in the form of sound waves to our ears, allowing us to hear the sound.
sound is made from vibration
Vibrations cause sounds. A sound wave is the vibration of the air around whatever is "causing" the sound (aka, whatever is causing the vibration--a guitar string, vocal cords, the mechanics of a stereo, etc).
Sound is created by vibration
Each signal vibration of an object produces a specific sound frequency. The frequency of the vibration determines the pitch or note of the sound. The intensity of the vibration affects the volume or amplitude of the sound produced.
The sound waves of irregular vibration in matter is called noise.
Think of it as a rubber band. No vibration, no sound. it's the same with a rubber band!