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

itoggle caption Christopher Clark

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

itoggle caption Bryan Bedder/Getty Images