do we have any adiastematic sources for Nuptial Mass (Extraordinary Form)? It seems that IN. "Deus Israel" and CO. "Ecce sic benedicetur" are somehow newer...
Both appear for the first time in the Vatican Edition (1908). Dom Pothier's Liber Gradualis (1883, 1895) and Dom Mocquereau's Liber Usualis (1903) have different chants.
According to John Boe in his article "The Roman Missa sponsalicia," Plainsong and Medieval Music (2002), 11 : pp 127-166, Pothier's source for the music of the introit and communion in the Vatican Edition was the St-Yrieux gradual (Paris, Bibliothèque nationale de France Lat. 903), which would be heightened Aquitaine neumes. Unfortunately there does not appear to be an online digital manuscript.
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