Many of the rhythmic indications of the ancient manuscripts were misinterpreted by the monks that edited the Solesmes editions. This is old news, now well known, and should no longer be a controversial statement in 2022, but here we are! Considering that they crafted these chants from other chants found in those manuscripts, it seems reasonable to interpret the rhythm according to those sources, not the 20th-century misinterpretation of them.
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