Gregorian Notation Is Easier! by Leonard J. Doyle, Reprinted from Musart, National Catholic Music Educators Association, 1958/01

Gregorian Notation Is Easier! by Leonard J. Doyle, Reprinted from Musart, National Catholic Music Educators Association, 1958/01, CMTH 10/07, Box: CMTH 10, Folder: 07. Michael A. Mathis Papers, MTH. University of Notre Dame Archives. https://archivesspace.library.nd.edu/repositories/2/archival_objects/390329 Accessed April 25, 2026.