Directorium chori : ad usum omnium ecclesiarum, tam cathedralium, quam collegiatarum, nuper restitutum, & nunc secundo in lucem editum (1589)
Catholic Church, Guidetti, Giovanni, 1532-1592 · Romae : Apud Franciscum Coattinum · leaf 611
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Gregorian chants · Service books (Music)
Internet Archive · Boston Public Library · Public domain (published before 1931). Free to use for anything.
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