1. For the Most Reverend Dominick J. Lagonegro, auxiliary bishop emeritus of the Archdiocese of New York and titular bishop of Modruš. I am grateful to Luisa Nardini, David Watt, Susan Boynton, and the late Alejandro Planchart for their comments and suggestions on earlier versions of this paper.
2. The manuscripts extant in the Archivio capitolare at Pistoia reveal that the cathedral chapter maintained a substantial library in the eleventh and twelfth centuries, one that included, inter alia, liturgical books, patristic texts, theological works, sermons, and treatises on music. Manuscripts C. 119 and C. 120 are graduals, while C. 121 is a troper; I will refer to them hereafter as Pst 119, Pst 120, and Pst 121, respectively. For more on these sources, see James Vincent Maiello, “On the Manufacture and Dating of the Pistoia Choirbooks,” Plainsong & Medieval Music 19 (2010): 10–21; Lance Brunner, “Two Missing Fascicles of Pistoia C.121 Recovered,” in Cantus Planus (Budapest: Hungarian Academy of Sciences/Institute for Musicology, 1990), 1–19.
3. See Margot Fassler, Gothic Song: Victorine Sequences and Augustinian Reform in Twelfth-Century Paris, 2nd ed. (Notre Dame, IN: University of Notre Dame Press, 2011); William Flynn, Medieval Music as Medieval Exegesis (Lanham, MD, and London: Scarecrow Press, 1999); Emma Hornby and Rebecca Maloy, Music and Meaning in Old Hispanic Lenten Chants: Psalmi, Threni and Easter Vigil Canticles (Woodbridge, Suffolk: Boydell Press, 2013); Emma Hornby, Medieval Liturgical Chant and Patristic Exegesis: Words and Music in the Second-Mode Tracts (Woodbridge, Suffolk: Boydell Press, 2009); Susan Boynton, Shaping a Monastic Identity Liturgy and History at the Imperial Abbey of Farfa, 1000–1125 (Ithaca, NY: Cornell University Press, 2006).
4. See Geoffrey Chew, "The Early Cyclic Mass as an Expression of Royal and Papal Supremacy," Music & Letters 53, no. 3(1972): 254-59
5. James Grier, "The Music Is the Message: Music in the Apostolic Liturgy of Saint Martial," Plainsong & Medieval Music 12, no. 1(2003): 1-14.