Cole Porter possessed to a singular degree the art of expressing depth through apparent frivolity. The effervescent wit and technical bravura of his songs are matched by their unguarded revelations of feeling. In the words of editor Robert Kimball, "Porter wrote tellingly of the pain and evanescence of emotional relationships. He gently mocked propriety and said that few things were simple or lasting or free from ambiguity." Of the masters of twentieth-century...