Radio today remains the most accessible and widely available communication medium worldwide, despite technological shifts and a host of upstart challengers. Since its origins in the 1920s, radio has innovated a new world of sound culture - now expanded into the digital realm of podcasting that is enabling the medium to reach larger audiences than ever before. Yet radio remains one of the least studied of the major areas of communication arts, due largely to its broadcast-era ephemerality. With the advent of digital technology, radio's past has been unlocked and soundwork is exploding as a creative field, creating a lively and diverse sonic present while simultaneously making critical historical analysis possible at last. This volume offers newly commissioned chapters giving readers a wide-ranging view of current critical work in the fields of radio and podcasting, employing specific case studies to analyze sound media's engagement with the arts; with the factual world of news, talk, and documentary programming; as a primary means of forging community along with national, transnational, and alternative identities; and as a subject of academic and critical research. Its historical scope extends from radio's earliest days, through its mid-twentieth century decades as the powerful voice of nations and empires, onto its transformation into a secondary medium during the television era, and into the expanding digital present. Over the course of 37 chapters, it provides evidence of the sound media's flexibility and adaptation across diverse cultures by examining radio's past and present uses in regions including the United States, Canada, Britain, Australia, Poland, China, Korea, Kenya, Angola and Mozambique, South Asia, and the Caribbean. Contributors include historians and media scholars as well as sound artists and radio/podcast producers. Notably, companion links to digital