My Wolf Trap concert ends with a bang: Gershwin’s “Love Is Sweeping the Country,” done in its original arrangement—a bracing two-step. The song comes from “Of Thee I Sing,” the first musical to win a Pulitzer Prize. But the award was given only to the book-and-lyrics team of Morrie Ryskind, George. S. Kaufman, and Ira Gershwin, not to the composer, George Gershwin. At that time, the Pulitzer was still strictly a literary prize—no musicians allowed.