Even Elvis himself, to his credit, did a parody of "Are You Lonesome Tonight" off the cuff, I believe. His lyrics went something like this:

Do you sit in your parlor and wish I were there?
Do you look at your bald head and wish you had hair?
Oh, dear are you lonesome tonight?

While it's great fun to trash Elvis, if you listen to the early stuff he did (interestingly, all before he entered the army) you'll find that he had a whole lot going on. Many of the best folk singers working today are borrowing more from Elvis than they are from, say, Pete Seeger.

Oh dear, have I committed some sacrilege?