The law of prayer is the law of belief. What we pray at the Holy Sacrifice of the Mass is just as important as how we pray it.
The brass setting was surprisingly similar to what we had at the Cathedral. Glorious...I have to say our brass quintet is one of my favorite things about Christmas and Easter.
I think that this hymn was actually sung at one of the Papal Easter Sunday Masses. It was by a choir from England, I believe.