"Sound is a traveling wave which is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing and of a level sufficiently strong to be heard."
You can analyze this question in two ways. You can look at it scientifically or philosophically. Above is a definition of what sound is.
Scientifically speaking, sound is an actual occurrence. If this is true, then if someone is present or not to hear it, it occurred.
Philosophically speaking, if no one was present to perceive the event one might contend that it did not occur. I am a believer in science. Although a human may not have been present to hear the event, animals were. In addition, matter was present for the sound wave to travel through.
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