Wikipedia explains some of the history behind the famous question, "If a tree falls in the forest, does it make a sound?" The article cites Scientific American who viewed this from a physical aspect and concluded that if no animal or person is there to perceive it, then it does not make a sound. So, it seems that sound exists only in the presence of a human or animal ear.
With this in mind, I have to ask a related question. Isaiah says, in Chapter 55 verse 12:
וכל עצי השדה ימחאו כף
All the trees of the field will clap hands
Perhaps, Isaiah, living centuries before the "forest" question was proposed, hadn't pondered this question at all. So, ol' DF (that's me) is here to pose the question that Isaiah didn't:
If trees clap in the field, and no one is there to hear the applause, did they make a sound?
I ask that your answer not make a "backward" inference from the "forest" question or what physics has discovered after Isaiah. Pretend that people during that time would have asked this question.