Oh, Kay! is a musical with music by George Gershwin, lyrics by Ira Gershwin, and a book by Guy Bolton and P. G. Wodehouse. It is based on the play La Présidente by Maurice Hennequin and Pierre Veber. The plot revolves around the adventures of the Duke of Durham and his sister, Lady Kay, English bootleggers in Prohibition Era America. Kay finds herself falling in love with a man who seems unavailable. The show is remembered for its enduring song, "Someone to Watch Over Me".