I've been alerted to this sublime excerpt of Vespers of Great and Holy Friday from the biritual Benedictine Monastery of Chevetogne. The Eastern-rite monks in this monastery observe the Russian (Nikonian) recension of the Byzantine Rite, making it one of the very few places where the Russian Orthodox liturgical tradition is celebrated in all its purity in communion with the Catholic Church. (The Ukrainians and other Greek Catholics observe different recensions or local traditions of the Byzantine Rite)
[Note: I will NOT tolerate snide remarks about how all of this is "modernist" and "ecumenist". The observance by Russian Catholics of the Russian Orthodox liturgical tradition -- nec plus, nec minus, nec aliter, in the famed words of Pope St. Pius X -- was fully approved by the Catholic Church decades before Vatican II]
Excerpt: Vespers of Holy Friday in the Monastery of Chevetogne