Christopher Clark graphed the peak levels of and RMS levels of three hit songs a year over the past three decades. This image links to a PDF of his full poster, "A Visual History Of Loudness." Christopher Clark hide caption

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Radiohead shocked the music industry by letting fans pay the price they wanted to download In Rainbows. John Shearer/Getty Images hide caption

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One of the earliest examples of music blogs' influence was the success of Arcade Fire in 2004. Paul Bergen/Redferns/Getty Images hide caption

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The Boys Choir of Harlem performs in 2005, in front of Lord & Taylor department store in New York City. Bryan Bedder/Getty Images hide caption

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