Bob Marley, seen here performing in Paris in 1980, died years before Legend was released. It has since sold millions of copies — and this week, it hit No. 5 on the Billboard chart. Guidot Lou/Dalle /Landov hide caption

itoggle caption Guidot Lou/Dalle /Landov

Jimmy Page, Robert Plant, and John Bonham of Led Zeppelin, in 1970. A new lawsuit says the group borrowed from another band's work without crediting it, for the huge hit "Stairway to Heaven." Roger Jackson/Getty Images hide caption

itoggle caption Roger Jackson/Getty Images

Pharrell Williams, center, performs "Happy" during the Oscars at the Dolby Theatre on Sunday, with the help of dancers who attend an L.A. high school (they're dressed in pastel colors). John Shearer/John Shearer/Invision/AP hide caption

itoggle caption John Shearer/John Shearer/Invision/AP

A map of the U.S. lists the musical acts that set states apart from each other. It's not a matter of an artist's popularity, says Paul Lamere, who made the map, but of a state's distinct preferences. Paul Lamere, Director of Developer Platform at The Echo Nest hide caption

itoggle caption Paul Lamere, Director of Developer Platform at The Echo Nest