Edward Kennedy “Duke” Ellington was the greatest jazz composer of the twentieth century—and an impenetrably enigmatic personality whom no one, not even his closest friends, claimed to understand. The grandson of a slave, he dropped out of high school to become one of the world’s most famous musicians, a showman of incomparable suavity who was as comfortable in Carnegie Hall as in the nightclubs where he honed his style. He wrote some fifteen hundred compositions, many of which, like “Mood Indigo” and “Sophisticated Lady,” remain beloved standards, and he sought inspiration in an endless string of transient lovers, concealing his inner self behind a smiling mask of flowery language and ironic charm.