music that had until then belonged almost exclusively to New Orleans, to the river towns of the American South, and to African-American neighborhoods in New York and Chicago. Almost overnight, radio made jazz a national phenomenon. Musicians such as Duke Ellington and Louis Armstrong became household names. Ellington’s band performed weekly national broadcasts from the Cotton Club in Harlem starting in the late 1920s; Armstrong became the first African-American to host his own national radio show shortly thereafter. All of this horrified Lee De
