"I will add that even if that musician had finished his work, that would not prove that his interpretation ought to be preferred to that which has been recently constituted after patient researches by the Abbey of Solesmes, for the Benedictine texts are based on the copy preserved at the monastery of St. Gall of the antiphonary of Saint Gregory, which represents the most ancient and the most certain monument which the Church preserves of the true plain chant.
"En Route"
J.-K. (Joris-Karl) Huysmans
The Monastery of St. Gall possesses a copy of Gregory's antiphonary, made about the year 780 by a chorister who was sent from Rome to Charlemagne to reform the Northern music, and in this the notes are indicated by "pneumss," from which our notes were gradually developed, and first arranged along one line, to which others were gradually added.
"The Pleasures of Life"
Sir John Lubbock