How Hip Hop Became Hit Pop examines the programming practices at commercial radio stations in the 1980s and early 1990s to uncover how the radio industry facilitated hip hop's introduction into the musical mainstream. Constructed primarily by the Top 40 radio format, the musical mainstream featured mostly white artists for mostly white audiences. With the introduction of hip hop to these programs, the radio industry was fundamentally altered, as stations struggled to incorporate the genre's diverse audience. At the same time, as artists negotiated expanding audiences and industry pressure to make songs fit within the confines of radio formats, the sound of hip hop changed. Drawing from archival research, Amy Coddington shows how the racial structuring of the radio industry influenced the way hip hop was sold to the American public, and how the genre's growing popularity transformed ideas about who constitutes the mainstream.