Modern Editions of Palestrina's Music I: Comprehensive Editions
This is described as the first critically supervised collected edition. Each volume of music is printed with the cleffings and notes values found in the primary sources. Each has a substantial preface with detailed information about the sources consulted for the works contained in it. Volumes 1-6, however, were not initially designated as pa rt of this edition and were published separately. Although this opera omnia is popularly known as the "Haberl" edition, several editors contributed: Theodor de Witt edited vols. 1-3, Franz Espagne edited vols. 4-8, and Franz Commer edited vol. 9. Haberl himself was responsible for vols. 10-33.