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Pop music is often considered a reflection of changing culture in the United States — and between 1960 and 2010, songs featured in the Billboard Hot 100 varied greatly. Researchers in England recently analyzed almost all the singles that charted during that period to reveal trends in the evolution of popular music—noting, among other things, that the biggest revolution to occur was the birth of rap in 1991 and that, with the exception of a brief synthesizer-happy period in the 1980s, there’s always been a lot of diversity in American pop.
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