Kam mir gestern unvermittelt einfach in den Kopf. Nobody knows it, but you've got a secret smile. And you use it only for me. Semisonic - Secret smile from Kike on Vimeo .
Sound is a travelling wave which is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing and of a level sufficiently strong to be heard, or the sensation stimulated in organs of hearing by such vibrations