I'm very sad to hear that Johnny has left us.
About 35 years ago, I first saw Johnny at the Angel FC in Bedford, and he showed me DADGAD tuning - the first I'd heard of it (I was a newbie then). I'm eternally grateful for that, Big Man.
As so many have said, you just expect him to be there.
My condolences to Joyce, and to all his friends and family.