From the heights of Sleepy Hollow Cemetery, the bards surely look down upon their Concord with pride. The little hamlet, where the nation’s spark of independence was lit on April 19, 1775, brought forth a second uprising in the mid-nineteenth century. With the publication of “Nature” by Ralph Waldo Emerson in 1836, Concord launched a revolution of philosophy and literature that made Concord the center of political, literary, and social zeitgeist for over a century.