WellI learnt it as Non Illegitemi Carborundum, which is even worse Latin but rolls off the tongue better.
Bragging time - if at 2nd hand. On holiday in Galloway my wife Meg and I stopped to view a ruined abbey south of Ayr. We were told that the chapterhouse still had its roof and the acoustics were marvellous. What to sing? Gaudete of course, and they were.
Some weeks later, on a singing course in Cumbria, Meg stood under an old bridge with Maddy Prior, told the story, and Maddy sang Gaudete for her there and then.