The correct pair of words is; pressure wave and vibrate.
The sounds of an harp are consequent of;
The series of action which arises each time the soundboard rises, creating pressure waves. The air right around the harp is pushing on the air that is a bit further away and so on and so on. Eventually, this push gets to the ear. The pressure waves sail right on in to the ear drum and press on it and ultimately, a sound is born.
When the string vibrates, it causes the air around it to move.
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