Categorizing Sound addresses the relationship between categories of music and categories of people: in other words, how do particular ways of organizing sound become integral parts of whom we perceive ourselves to be and of how we feel connected to some people and disconnected from others? After an introduction that discusses the key theoretical concepts to be deployed, Categorizing Sound presents a series of case studies that range from foreign music, race music, and old-time music in the 1920s up through hillbilly and swing music in the 1940s, soul music in the 1960s, country and rhythm and blues in the 1980s. Each chapter focuses on the process of “gentrification” through which these categories are produced and how these are articulated to categories of identity (especially those of race and gender). This process is traced by an analysis of the discourses through which ideas about genres circulate, the institutions that either support and sustain genres or withhold their support, and the sounds that become identified with a particular genre and a particular demographic group. The conclusion discusses the pertinence of the approach to genre used in the book to the changes brought about by the internet and file sharing to the circulation of popular music genres.