Table Of ContentPietro Aaron on musica plana: 
A Translation and Commentary on Book I of the 
Libri tres de institutione harmonica (1516) 
 
Dissertation 
 
Presented in Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy 
in the Graduate School of The Ohio State University 
 
By 
Matthew Joseph Bester, B.A., M.A. 
Graduate Program in Music 
 
The Ohio State University 
 
2013 
 
 
Dissertation Committee: 
 
Graeme M. Boone, Advisor 
 
Charles Atkinson 
   
Burdette Green
Copyright by 
 
Matthew Joseph Bester 
 
2013
Abstract 
 
Historians of music theory long have recognized the importance of the sixteenth-
century  Florentine  theorist  Pietro  Aaron  for  his  influential  vernacular  treatises  on 
practical matters concerning polyphony, most notably his Toscanello in musica (Venice, 
1523) and his Trattato della natura et cognitione de tutti gli tuoni di canto figurato 
(Venice,  1525).  Less  often  discussed  is  Aaron’s  treatment  of  plainsong,  the  most 
complete statement of which occurs in the opening book of his first published treatise, the 
Libri tres de institutione harmonica (Bologna, 1516). The present dissertation aims to 
assess  and  contextualize  Aaron’s  perspective  on  the  subject  with  a  translation  and 
commentary on the first book of the De institutione harmonica. 
The extensive commentary endeavors to situate Aaron’s treatment of plainsong 
more concretely within the history of music theory, with particular focus on some of the 
most prominent treatises that were circulating in the decades prior to the publication of 
the De institutione harmonica. This includes works by such well-known theorists as 
Marchetto  da  Padova,  Johannes  Tinctoris,  and  Franchinus  Gaffurius,  but  equally 
significant  are  certain  lesser-known  practical  works  on  the  topic  of  plainsong  from 
around the turn of the century, some of which are in the vernacular Italian, including 
Bonaventura da Brescia’s Breviloquium musicale (1497), the anonymous Compendium 
musices (1499), and the anonymous Quaestiones et solutiones (c.1500). 
 
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The topic of plainsong remained fertile ground for discussion and controversy 
among theorists in the fifteenth and sixteenth centuries, as arguments over solmization, 
tuning, and mode attest. Aaron, because of his overriding concern with practical matters, 
offers unique insight into many of these issues in the De institutione harmonica, the only 
one of his publications to appear in Latin. The treatise frequently has been overshadowed 
in  part because of its uneven quality  and numerous errors, characteristics that have 
prompted some scholars to question the rigor of Aaron’s early training in theoretical 
matters. Despite these deficiencies, Aaron’s first treatise deserves a fresh look, for it has 
much to tell us about an important period in the history of music history as well as about 
Aaron himself, an earnest musician who was striving to reconcile theory and practice, 
insofar as he understood both at the time.  
 
 
 
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Dedication 
 
Dedicated to Stefanie, 
my wife, my companion, and my best friend 
 
 
iv
Acknowledgments 
 
I would not have been able to complete this project without the generous support 
and assistance of a great number of people. First and foremost I want to extend my 
deepest gratitude to my advisor, Graeme Boone, for his guidance and support throughout 
my graduate career. Over the years I have benefitted greatly from our many wide-ranging 
discussions, over many cups of coffee, and I look forward to many more stimulating 
conversations in the years to come. 
I  am  also  very  grateful to  the other members of my  dissertation  committee, 
Charles  Atkinson  and  Burdette  Green.  I  feel  incredibly  fortunate  to  have  had  the 
opportunity to learn from both of them, both formally in many enjoyable seminars and 
informally in the course of many casual conversations. I have been profoundly influenced 
by the example that all three of my committee members have set, both in the high level of 
their scholarship and in the spirit of collegiality with which they interact with their 
colleagues and students. 
I  also  offer  my  sincerest  gratitude  to  Lois  Rosow,  chair  of  the  Musicology 
Department. I am humbled by the level of confidence that she routinely showed in me 
throughout  my  graduate  career,  granting  me  innumerable  professional  and  teaching 
opportunities. It was also from her that I first learned the basics of textual criticism. I also 
thank the other faculty members from the musicology department under whom I was 
 
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fortunate to study, including Arved Ashby, Margarita Mazo, and Udo Will. It has been a 
pleasure to be part of such an esteemed and supportive department. 
I also wish to thank Professors Frank Coulson and Will Batstone in the Classics 
Department at Ohio State, to whom I owe my training in reading and translating Latin as 
well as the basics of paleography. Whatever is accurate in my Latin translations can be 
traced to their instruction; any mistakes are mine alone. 
In addition, I am very grateful to the wonderful staff of the Music and Dance 
Library at Ohio State, especially Alan Green, Gretchen Atkinson, Sean Ferguson, and 
Michael Murray. I have benefitted greatly from their assistance throughout my graduate 
career, both as a student and as an educator, and I very much appreciate their kindness, 
support, and expertise. 
Through  the  years  I  also  have  been  fortunate  to  learn  from  and  enjoy  the 
friendship of many fine graduate school colleagues, many of whom have gone on to 
become outstanding scholars. In particular I wish to acknowledge my dear friends Nick 
Johnson,  Alejandro Madrid,  Andrew Martin,  Libby McDaniel,  Billee  Mitchell,  Nick 
Poss,  Debbie  Ruhl,  Erica  and  Tadd  Russo,  Beth  Szczepanski,  Joan  Titus,  and Josh 
Veltman. 
I also thank my colleagues at Saint Mark’s Episcopal Church, especially Paul St. 
Germain, Stephanie Arps, and Jessica Ellis, for allowing me the flexibility to pursue the 
completion of this project while continuing to work full time as Director of Music. I am 
very grateful for their support, encouragement, and understanding. I also am thankful to 
 
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the many members of the church who have expressed their support, particularly in the 
end stages of this project. 
I am also exceedingly grateful to Roberta Morton, Mary Mae Riego, and Dianne 
Silliman for volunteering their time in recent years to provide childcare, allowing me the 
opportunity to get away periodically in order to make progress on this dissertation. I 
could not have sustained the momentum necessary to complete this project without their 
assistance. 
 I am particularly thankful to the many friends who have expressed interest in this 
project and have offered their support over the years. I am especially grateful to Dennis 
Bassett, Matt Croy, Gary Garber, Bevan Keating, Ted Meyers, Michael Murray, and Jim 
Vaigl, whose friendship has been a source of strength and encouragement. 
Lastly, I thank my family for their tireless and unwavering support. In particular, I 
thank  my  mother  and  stepfather,  whose  constant  encouragement  has  always  been  a 
source of strength. Most importantly, I am forever grateful to my wife, Stefanie, whose 
unconditional love, support, and encouragement has meant more to me than I can say. 
Finally,  although  they  were  latecomers  to  this  project,  I  also  thank  my  two  young 
daughters, Elisa and Maria, for their love, their patience, and their support, particularly in 
the busy final months of this project.  
 
 
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Vita 
 
April 20, 1975   Born – Minneapolis, MN 
1997   B.A. cum laude Music, Harvard University 
2000–2001   University Fellow, The Ohio State 
University 
2001–2005   Graduate Teaching Associate, Department 
of Music, The Ohio State University 
2006   M.A. Music, The Ohio State University 
2006–2009, 2011–12   Lecturer, Department of Music, The Ohio 
State University 
 
Publications 
 
1.  D.W. Latham, B. Nordström, J. Andersen, G. Torres, R.P. Stefanik, M. Thaller, 
and M.J. Bester, “Accurate Mass Determination for Double-lined Spectroscopic Binaries 
by  Digital  Cross-correlation  Spectroscopy:  DM  Virginis  Revisited,”  Astronomy  and 
Astrophysics 314 (1996): 864–70. 
 
 
 
Fields of Study 
 
Major Field: Music 
 
viii
Table of Contents 
 
Abstract    ii 
Dedication    iv 
Acknowledgments    v 
Vita    viii 
List of Tables    x 
List of Figures    xi 
Introduction    1 
Chapter 1: Biography and Works    8 
Chapter 2: Aaron’s Introduction to Plainsong    31 
Chapter 3: The Gamut    61 
Chapter 4: Solmization and Mutation in Plainsong    128 
Chapter 5: Intervals and Modes    187 
Chapter 6: Conclusion    238 
Text and Translation    245 
Bibliography    336 
Appendix A: Extant Copies of Pietro Aaron’s Libri tres de institutione harmonica    351 
 
 
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Description:commentary on the first book of the De institutione harmonica Figure 2: Gamut according to Pseudo-Odo of Cluny, Dialogus de musica, Chapter 2.