Full color facsimile of León, Catedral de Santa María de Regla, Ms. 8, a rare 11th- century antiphonary containing all the chants for the mass and office in calendar order, plus the chants for feast days and Sundays. It is the most important musical codex of the hispanic liturgy and one of the most representative musical codices of the West. At the same time it is the only complete visigothic mozarabic antiphonary that has survived.