I have found this two beautiful videos of Iste Confessor but there is no reference on the authors and notations. If someone recognizes the hymn tunes or the authors I would be most grateful.
Thanks, I fixed the link. Now it should be all right.
Here's a routine reminder: Avoid flames: critique principles, not people. Be discriminating but don't nitpick. Be academic not acerbic. Be principled not polemical.
hymnary.org credits the second tune to a Poitiers Antphoner, 1746. Perhaps Cyril Pocknee talks about it in his book, French diocesan hymns and their melodies. Unfortunately, I don't have a copy (yet).
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