Keberoxu, that "Tannenbaum" recording by Nat was exactly what I was thinking of.https://www.youtube.com/watch?v=2mP9T8BQ_bQ
The first line is tolerable, and then it gets worse and worse and....
But when Nat sings "Nature Boy" or "Straighten Up and Fly Right" or "Route 66," nobody can surpass him.
-Joe-