When Walt Whitman self-published his Leaves of Grass in July 1855, he altered the course of literary history. One of the greatest masterpieces of American literature, it redefined the rules of poetry while describing the soul of the American character. Throughout his great career, Whitman continuously revised, expanded, and republished Leaves of Grass, but as Harold Bloom reminds us, the book that matters most is the 1855 original. In celebration of the poem's 150th anniversary, Penguin Classics proudly presents the 1855 text in its original and complete form, with a specially commissioned introductory essay by Harold Bloom. For more than seventy years, Penguin has been the leading publisher of classic literature in the English-speaking world. With more than 1,700 titles, Penguin Classics represents a global bookshelf of the best works throughout history and across genres and disciplines. Readers trust the series to provide authoritative texts enhanced by introductions and notes by distinguished scholars and contemporary authors, as well as up-to-date translations by award-winning translators.