Yes because a dog, a cat or a bird might hear it and further the earth would "feel it" (important) so the event itself is taken place sound or no sound. The world moves on with or without us because we are just small components of the world. However the last part of the comment below is also true. I believe what is being said in the below comment is "don't ponder it, just live it". This is even better but sometimes pondering is what gets you there. Hope this helps a bit.
The tree will cause a disturbance in the air particles around it, sending out waves of sonic vibrations which could be defined as sound. The problem here is that the term "sound" refers to the translation of these sonic vibrations into a format our brains recognise. The sound is there in essence, it still exists, but it isn't there conceptually, as in something that can understood and defined, because there are no minds present to perform that action.
Take for instance, the tree that fell. If no people are around, is that tree a tree? No minds are present to give it that terminology, to apply the concept of what we as human beings understand to be a tree, to that tree. But the tree is still there in essence, it still has its physical form and for all intents and purposes, exists. It's just that there's no one around to identify it as a tree.
If there are no ears around, it wouldn't make a sound. It would just produce a wave through the air, but the sound is created in the ear (well, rather in the brain). Just like colours, they don't exist in nature per se; it's the eye and the brain what turn electromagnetic waves into colours.