Easy On the Diphthongs, There, Sparky
Bing Crosby may have had a passable croon, but when I hear him doing "Adeste, Fideles" in Latin, I can feel the vibration of every voice teacher and choir director I've ever had spinning in their graves. Which is kind of sad, because I don't think any of them are dead.
"Vayy-nee-tayyyy ah-dorr-ayyyyyyyy-moos, Doooow-mee-noom!"
Or at least, they weren't dead...