PBS
Pbs: Cole Porter: You're the Top
A high school lesson plan designed to delve deeper into the life of Cole Porter and the meaning in his music.
PBS
Pbs: People and Discoveries: Kdka Begins to Broadcast 1920
This site from PBS details the history of radio and KDKA (Pittsburgh, Pennsylvania) the first radio station to offer programming. Mentions: advertising, NBC Radio, mass culture.
Independence Hall Association
U.s. History: The Decade That Roared
A very brief overview of the decade between the end of World War I and the Great Depression.