Now, the choir may not be actually using the chant notation, but the video does make the square notes very prominent. Is there a big disconnect here between the notation and the performance, or am I just going crazy?
That (the aural not the visual) is the setting by the now emeritus of Notre Dame de Paris, Jehan Revert (b. 1921) - Prose de Pâques grégorien harmonisé par Jehan Revert.
The metrical adaptation is probably designed with a vast diaphanous acoustic in mind; it helps to keep things together, as it were.
The Hymnal 1982 does this with a couple chant hymns- actually printing them in a triple-meter. Then there's a little note about how you can sing it normal if you want. Drives me crazy.
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