Now that I am thinking about it....

Much like Freddy Mercury, I think Robert Plant and Steven Tyler should be hands (or voiceboxes) OFF! Can't do them unless you completely change the song around- that scream at the end was just WRONG. I have heard Aerosmith in concert and Steven Tyler is simply amazing- even as an encore he can sing that song and hit every note. In fact when I saw them in concert the first time it actually freaked me out a little because I thought it might be terrible in person, especially after all those years (and drugs), but it was freaking amazing!