I would also mention these three chants are also sung at St. Albert the Great Priory, our House of Studies in Oakland. We sing the Evigila with the Nunc Dimittis daily from Ash Wednesday to the Third Sunday of Lent; we sing O Rex with the Nunc Dimittis from the Third Sunday to the Triduum. The Media Vita is sung in place of the short responsory In Manus tuas after the reading on First and Second Vespers of Sundays and Solemnities and everyday during Holy Week. On other days of Lent, we sing another Dominican responsory, the In Pace in place of the short responsory.
I hope this provides readers with a spiritual meditation on the spirituality and liturgy of Lent in anticipation of Holy Week and Easter.
With special thanks to Bro. Innocent!