I am not saying that sound waves and vibrations are not created. They certainly are, whether we can perceive them or not. However, different beings can interpret the same sound waves differently; sound is not a constant. In my mind this proves that "sound" is only a label for the way we perceive any given sound wave. There is a flaw in your example about infrared or ultraviolet waves. We know these waves exist just like we know the sound waves exist. Human anatomy does not have any sensory organs for registering these waves so they are not a fair comparison. Again, the I am not debating the existence of sound waves, only the point at which they become what we recognize as "sound".