Some opera singers do something with their voices that to me sounds a bit silly. It is probably a stylistic element that id difficult for me to understand.
Richard Tauber's Dein ist mein ganzes Herz aus Land des Lächelns has this thing at 0:32.
I also hear Kaufmann use it at 0:38
I have heard stronger versions of it that sounded like the singer had a bad singing day but since so many use it I must be wrong.
I have been told that in classical singing the equalization is very important. But at the same time they use this thing a lot in opera. To me it sounds like a singer trying to use too much head voice in the higher notes.
What is this vocal technique called and why is it used?