Billy Strayhorn (right), born 100 years ago, spent the majority of his career as a composer and arranger for the Duke Ellington Orchestra. David Redfern/Getty Images hide caption

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Duke Ellington's compositions present a timeless contribution to American music's legacy. Victor Drees//Evening Standard/Getty Images hide caption

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Duke Ellington in 1971. Louis Panassié/Courtesy of Wikimedia Commons hide caption

toggle caption Louis Panassié/Courtesy of Wikimedia Commons

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