Ryan Truesdell conducts his Gil Evans Centennial Project onstage at the 2012 Newport Jazz Festival. Erik Jacobs for NPR hide caption

itoggle caption Erik Jacobs for NPR

In 1974 Gil Evans recorded an album of Jimi Hendrix's music; the two had planned to collaborate before Hendrix's early death. Michael Ochs Archives/Getty Images hide caption

itoggle caption Michael Ochs Archives/Getty Images