I'm trying to put an end this age old question, but I want to translate it into form of an equation. SOME SAY: No, because "sound" is ears interpretation of those waves. I SAY: Yes, because it makes a "sound" (as defined by the vibrations). I'm going by text book definition. It makes sound because sound is a wave vibration of physical matter. Whether or not it gets heard (perceived by ears), that sound still resonates with other medium. (reflects off a tree, hits blade of grass.) To me, that's like End Of Story. When I read about all the factors of sound being formed, sound in motion, sound being translated through medium... only in the end, in it's final stretch of it's lifespan does the sound get heard or not get heard. To me it's just as cut and dry as the sound wave exists = there is sound. Put a video camera out there. Not only will it give you hard evidence in Dolby stereo, but you can watch the events that caused it. If y=tree falling and x=sound generated, how would you put into an equation that x is true regardless of the medium of translation?