Responding to the Second Vatican Council's call for a "more critical edition" of chant based on the earliest manuscripts, the International Society for the Study of Gregorian Chant (AISCGre) has produced the 2011 Graduale Novum, containing melodic restitutions based on a re-examinition of the 11th century melodic sources used to prepare the Vatican Edition of 1908, along with the staffless neumes in St. Gall and Laon notation.
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