Watch Empire of the Air: The Men Who Made Radio

This Ken Burns documentary traces the development of the medium of radio as both means of communication as well as entertainment. It focuses on the contributions made by three key pioneers of radio in the USA, Edwin Armstrong, Lee DeForest and David Sarnoff, as well as the influence of such geniuses as Reginald Fessenden and Guglielmo Marconi. It effectively intersperses audio as well as musical clips from radio programs of bygone eras to tell its story.