I love to be able to fuse two topics into one! Since almost the beginning of TeeVee, there has been theme music for its programs. Many of you will remember lots of them, but there were some programs without music, the very first TeeVee image being one of them, although it got a theme later. Does that pique your interest?
TeeVee became widely available in the late 1940s, in large part because of the revolutionary improvements in electronics because of the necessity of the war effort. However, there is a backstory to that as well: after the war was over, there was a flood of components that were military surplus, available for cents on the dollar, to be had by manufacturers.
TeeVee had been invented long before World War II, but the components were rare and expensive. Because of the glut of surplus components, TeeVee became widely available, but that is more of a Pique the Geek piece.