>>> an a cappella score like the one shown on this video
not an 8 page version with a piano practice score [GIA]. Giovanni Battista Pergolesi died in the 1700s, surely his work is in public domain … somewhere?
My guess is that the so-called Pergolesi Surrexit Christus could well be a contrafactum of some other work (perhaps not even by Pergolesi). This wouldn't be the first (nor the last) time such a thing has transpired.
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