By far the smartest writing I've ever seen about pop music. Hajdu draws a line from the sheet music craze of the late 19th century, through vaudeville, Tin Pan Alley, Hollywood's early talkies, the Cotton Club, Billboard charts, early recording technology, swing, jazz, the blues, the Brill Building, hip-hop, early MTV, and electronica, right up to the curious proliferation of top 40 songs about menages a trois in the 2010's. Hajdu is clearly a passionate music lover, but he's seasoned enough to be clear-eyed, circumspect and far-sighted in his appreciation and criticism. As an example, his take on the problem with Auto-tune in pop songs is not what you first expect, and it gets at the fundamental reason why pop music matters - no matter the format, or the year, or the genre, pop music connects us to human emotions that we all understand. Incredibly insightful, and highly recommended.