Heinrich Schenker ranks among the most important figures in the development of western music theory in the twentieth century. His approach to the analysis of music permeates nearly every aspect of the field and continues to this day to be a topic of great interest among music theorists, historians, composers and performers.

In his four volume work, Die letzen Sonaten von Beethoven: Kritische Ausgabe mit Einführung und Erläuterung (The Last Piano Sonatas by Beethoven: Critical edition with Int...