Sound is one of the most sophisticated senses we have since we regularly experiment and create innovative displays specifically for our ears. (I don’t believe that you can base this argument on the fact that since we create great work for a specific sense we can assume automatically make this assumption.) From the time we are very small, our entire world is filled with sounds targeted at stimulating or affecting our behaviour. We grow to expect pleasure or annoyance at surprising new sounds as well as established ones.
Sound comes in a variety of forms — whether voice, music, sound effects or other forms of communication — and they can be incredibly complex, rich, and often subtle. It is the primary way most of us receive data, information, and knowledge. While we encounter encounter much of these through reading, still, and increasingly, the majority of our understanding comes from hearing. Even visual media, such as television and movies, deliver the majority of emotions through music. This isn’t to say that there aren’t compelling visuals to stimulate our emotions or convey information. However, try turning off the sound on the television and interpret what is happening. You’ll most likely find it’s more difficult than simply turning off the picture and keeping the sound ( excerpt from experience design, Nathan Shederoff).