As Pray Tell reported, it is not permitted to add invocations to the Agnus Dei with other Christological titles. It is permitted to repeat “Agnus Dei” as many times as needed. A door has opened, and we’re going through it this Pentecost Sunday at the abbey. We’re going to repeat “Agnus Dei” in many languages. As befits Pentecost, the Spirit brings about unity around the Table from the many languages of believers. We’re doing tropes in Hebrew, Greek, Esperanto, German and Japanese (recalling our Bavarian origins and our mission in Japan), and Spanish (the second-largest language group in U.S. Catholicism).
Schola does primitive organum on the congregational parts.
Here it is: