Bisket, sarcasm is a high artform and not the least bit childish. Reference Spaw.

The version I gave came from a Dogpile search; I personally have never modulated to A, but now that you mention it, I have heard versions that do. (We know Kris did; did Janis?).

I think if you play the first A for one measure to establish the new key before vocals might work.

Ed