Oh, I wasn't aware it's orignally Gregorian chant! I hear it every year in Polish at the ecumenical (Orthodox and Roman Catholic) procession on the cemetery belonging to my parish. In Polish (however, I hear it chanted by better cantors) sounds it in such way: https://www.youtube.com/watch?v=YRyQjL3z2kcMalpanaGiwargis said:I think the chants at the Requiem Mass and the Office of the Dead are my favorites in the Gregorian repertoire. My favorite of all is the antiphon Ego Sum Resurrectio et Vita ("I am the Resurrection and Life"), sung with the Canticle of Zechariah at Lauds of the Dead and by the priest at the graveside.
Your link doesn't work for me, but I've found this one: https://www.youtube.com/watch?v=PvOidZcaGh0
Paschal alleluia with the hymn we're talking about. What a coincidence - today is the 1st anniversary of the funeral of fr. Zbigniew that I liked so much but I couldn't be because of the interview with the Antiochian patriarch.