I may be coming late to the party but my copy of Alberto Turco's Gregorian Chant: Tones and Modes (translated by Stefano Concordia O.S.B.) just arrived. It is a treasure.
Istituto Di Paleografia Musicale - Roma Pubblicazioni del Corso Superiore di Paleografia e Semiografia musicale dall'Umanesimo al Barocco Serie I: Studi e Testi / 4 Paleograjia, I
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