That is sad news. Fenno was the guy that first showed me that choral singing was more than just making "the right noise", and that a group of singers was more powerful than any one member.
He probably won't remember me – he wouldn't even if he were not ill, I was just another tenor among hundreds. But, let him know that I've continued singing in a chorus for 20 years, all because he taught me what a joy it was.
My prayers for him and you, and your family.