Just like the violin strings, your voice is also a vibration that travels through the air. Your auditory nerves are stimulated by vibrating air molecules. These vibrating air molecules cause other adjacent molecules to vibrate and the motion is carried through the air to your ear. This is mechanical energy creating your ear drum to vibrate, allowing you to hear the sound that was created. There are different dynamics to singing. For example forte, which means loud. This means your voice increases in the amplitude which is the loudness.