Originally Posted By: The Pook
... the tree falling in the forest with no human being there to observe it still exists...


I made no mention in my post of human beings:
 Originally Posted By: twosleepy
But if you define sound as the interpretation of those waves by something designed to do so (a brain, by way of the ears)...


If you are a (Jewish, Muslim, Christian) believer, then God is automatically included, since God created people in his/her image ("...male and female S/He created them...), therefore God has ears and a brain, after some fashion, and would, indeed, hear the tree, assuming s/he was paying attention... I actually shortened my original post before posting, and the part I removed was about the birds and the bees, who might also be there to hear it. All I know is, if a tree falls in the forest and I'm not there, I won't hear it!! LOL! ;0)