This is an interesting topic for me. I used to say the same thing, until I read
Sing to the Lord, the USCCB’s most up to date document on music, released near the end of 2007. I actually was, overall, very pleased with it. It is a
major improvement over the
Music in Catholic Worship**, the conferences first attempt decades ago. There’s a lot that’s really good in it.
Now it
does say that things like “Prince of Peace” are acceptable: “When the Agnus Dei is sung repeatedly as a litany, Christological invocations with other texts may be used. In this case, the first and final invocations are always Agnus Dei (Lamb of God).” (188)
Does anybody have any information on why this is or is not valid? I can’t see anything that rules it out in the GIRM. People often cite GIRM 366:“It is not permitted to substitute for the chants found in the Order of Mass, e.g., at the Agnus Dei.” However, this seems to refer to substituting an entirely different chant, as opposed to what the USCCB document is talking about (for example, singing “City of God” in place of the Angus Dei).
However, Sing to the Lord is not a binding document. It does not carry the necessary recognitio of the Holy See because it failed to get the necessary votes in order for it to happen. Therefore, Liturgiam Authenticam and the official statement made by the Congregation for Divine Worship when it released the first part of the new translations carry the force of law.
Composers such as Marty Haugne, David Haas and Bob Hurd do not have the authority to override what the Holy See has stated. In this case, Liturgiam Autneticam states no paraphrases.
I was cleaning my room a couple of weeks ago and I came across some of the notes at a meeting some years ago of the Federation of Diocesan Liturcical Commissions. One of the regions noted that Liturgiam Authenticam was not a suitable document for use in the United States. I read my side notes indicating “Say what?” It bothered me then to the point that I told someone in my region that I smelled trouble brewing.
Sing to the Lord was supposed to have carried more teeth, more weight and was supposed to be in compliance with Liturgiam Authenticam. Unfortunately, the comments that I have from that FDLC meeting led to the group teaming up with the National Pastoral Musicians association to gut the document and render it to a paper tiger with little to no authority.