A few Advents ago the new Missal came out. Prior to that point, a typical wedding would begin with the Penitential Rite, which, quite honestly, though probably a good thing to do, was always a bit awkward especially when there were a lot of non-Catholics present. (Personal opinion.) In its stead, when there is a nuptial Mass, we begin with the Gloria - which I like better, but is difficult when there are few (practicing) Catholics in the congregation and it is just me and soloist belting out God’s praises. But it is amazing when it is a bunch of Catholics.
So think back to that first advent of the new Missal. I’m about to concelebrate a wedding at our cathedral and the question comes up, “Do we sing the Gloria?” After all, it is not prayed all during the Advent season. Right? But the new rite calls for it. This was not one of the topics covered when we went to all of the workshops on the new Missal. So, the other clergy, the musicians and I huddled together to make a decision. Although it went against our instincts, it seemed that that the rubrics clearly called for the Gloria to be sung. So we did.
When I got home I called the liturgy office for a response. Nobody was in so the person who was the liturgist for the diocese at the time called back a few days later. We had a pleasant conversation and then got down to discussing the wedding Gloria. The person was very honest and said, “I am not entirely positive but I can tell you this: There was a wedding at the cathedral earlier this week and they sang the Gloria so I would use that as your example until we can confirm so.”
As it turns out, singing the Gloria is the correct thing to do. It is part of the ritual for this particular type of liturgy and therefor when a nuptial Mass is said, the Gloria is always prayed even when otherwise it would not be.
And that is why we now sing the Gloria at nuptial Masses.