The Fourth International Schenkerian Symposium took place at Mannes College of Music during March of 2006, a year that marked the hundredth anniversary of the publication of Harmonielehre and, in a very real sense, the beginning of the Schenkerian enterprise. The essays in this volume are organized into three categories -- analytical, theoretical, and historical. Among the analytical essays is Carl Schachters brilliant discussion of large-scale connections in the opening scenes of Don Giovanni. The theoretical section includes a comparison of two perspectives on sonata form by Allen Cadwallader and Warren Darcy. In the historical section, Robert Wason details the publication history of Harmonielehre and the checkered career of its translation into English. Like the previous volume published by Olms Verlag, this collection gives testimony to the ongoing exploration of Schenkers ideas by American and European scholars.