From the Papal Mass in Domplatz: the proper communion chant.
“Thou lovest justice and hatest wickedness. Therefore God, thy God, hath anointed thee.”
It looks to me like they are singing from a blown up copy of the Graduale Triplex with hand copies verses on the right. This is a great illustration of the merit of having the Triplex online, so that other groups can produce similar editions.
