As light and dark create the image, so create the sound track.

Essentially, images are created using regions of relatively more brightness, referred to as "light", and regions of relatively less brightness, referred to as "dark". Similarly, sound tracks may be broken down to the fundamental level as patches of sound and silences. Therefore,
As light and dark create the image, so sound and silence create the soundtrack.

Aform of energy that is reflected or emitted from objects in the form of electrical and magnetic waves that can travel through space. there are many forms of  electromagnetic  energy including gamma rays, x rays, ultraviolet radiation, visible light, infrared radiation, microwaves and radio waves.