There is a reason this question in rhetorical: it has no answer.
The people who answer this are split into two groups: the people who think sound is sound, and the people who think sound is waves.
I am in favor of the answer "no". If no one is around to hear it, it is not called sound but waves. What if I used an example out of a foreign person speaking. Say that no one knows the language he is speaking, let alone if it exists or not. To us, he is saying only words. It is not communicating unless someone is there to "translate" those words into information. Otherwise he is speaking, not communicating.
Same goes with the sound. If no one is there to hear it, it isn't called sound because SOUND DOESN'T EXIST. If humans were born without ears, and an alien race with ears that could hear came over, we wouldn't believe a word of what he was saying if he tried to explain sound to us. How would you convince us it exists? It is just energy: no feel, no sight, no nothing. It is JUST A TRANSLATION. If it is not translated IT DOESN'T EXIST. Otherwise they are only called vibrations.
Now, don't get me wrong, there is another side to every coin. Some people say that sound is sound, no difference is someone is there or not, but that is only because they know about it. If they never knew about it (which goes back to being born without ears) they would say it doesn't exist, which is doesn't make "sound". But, that is their opinion and mine is mine.
It is rhetorical, and is answered based on if the person sees sound as vibrations or sound as it is.