Old Wort's tastes were ecclectic and discerning. He didn't shown too much interest in Folk but he was a big fan of Blues and opera and gladly joined in with Leontyne Price and my daughter, both live and recorded, but showed little ear for Callas. I think he could tell she sang off key at times. Wort at a Howlin' Wolf Session
Fortunately his interest was primarily auditory. Unfortunately he has gone deaf in recent years and only responds now when you lift his ear and sing directly to him.