Werner Klemperer was a fine musician with a good singing voice. Here are Klemperer and Banner singing Silent Night in German.
https://youtu.be/ihYJpvRgpCM
Klemperer only took the Klink role on the guarantee that the character would come across as a bumbling fool.
Great You Tube performance with little Le Beau coming in at the end! As you probably know, Klink was almost as lovable as Sgt. Schultz.
Isn’t his brother the famous orchestra conductor Otto Klemperer? Were they really Jewish?