The evolution of broadcast programming can be identified into four stages. The first stage covers the debut of commercial radio in the 1920's. At that time the tone was considered proper, and formal. For several years radio broadcasting emphasized classical or semi-classical music, and historical drama. Commercials were kept brief and always discreet In the second stage of programming, which was called The Golden Age of Radio, shows were action adventures. Vaudeville-Comedy was also popular. The hard ships of the 1930's and then World Wa ....