The main point of focus in a visual display is called figure which is the answer. In the geometry optics, the focus which is known as the image point is where the light rays come from a distance on the object being focalize.
If there were no copyright laws, you would not be able to protect your music after releasing it. People could take parts, or even your entire song and claim it as their own, and you would have no legal bounds or actions against the plagiarism of your work.
