The Vatican Edition is not "now known to be inaccuarte." It has always been known to be inaccurate. For some this is an offense; for others a feature.
Some on this thread have suggested that there are problems with the 1908 edition. What was wrong with it, specifically? Please cite sources.
The so-called Cantatorium of St. Gall, the earliest complete extant musical manuscript in the world with neume notation. It contains the solo chants of the Mass and constitutes one of the main sources for the reconstruction of Gregorian chant. Written and provided with fine neumes in the monastery of St. Gall between 922 and 926. Bound in a wooden box with an ivory panel on the front cover, most likely Byzantine c. 500, depicting scenes from the fight of Dionysos against the Indians. The ivory panel was once the possession of Charlemagne.
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