I find it pretty funny when Keillor clowns around with singers like his fairly frequent guest, opera singer Renee Fleming. She obviously gets a real snort out of it, too, as do other singers that he sings with.

And the audience plainly gets a kick out of it.

Chacun à son gout.

You will note that he always gives other guest singers on the show plenty of chance to do their own thing without him.

...two knobs on your radio....

Don Firth