George Carlin was arrested in 1972 for performing "Seven Dirty Words You Can Never Say On Television" and charged with violating obscenity laws. Marty Temme / WireImage hide caption

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Sandy Denny Steve Wood/Hulton Archive/Getty Images hide caption

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John Lennon (at left) and Paul McCartney in November 1963, just before the release of With the Beatles. Fox Photos/Getty Images hide caption

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Django Reinhardt would play any chance he got. At the height of his fame, he'd stroll into a bistro with his guitar and busk — not for the spare change, but just to play. Michael Ochs Archives/Getty Images hide caption

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Liam Clancy (far right) with the Clancy Brothers in 1960. From left to right: Tommy Makem, Pat Clancy, Tom Clancy, and Liam Clancy. David Redfern/Redferns/Getty Images hide caption

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Swedish singer Victoria Bergsman, who records as Taken by Trees, reworks the melodies and rhythms of Pakistan on East of Eden. Victoria Bergsman hide caption

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Les Paul performs live at the Winter Garden on May 27, 1992. David Corio/Michael Ochs Archive/Getty Images hide caption

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