Axl Rose The Greatest Vocalist Of All Time?
I'm not sure how vocal range qualifies one to be greatest vocalist of all time, but that seems to be argument presented here. There is so much more to singing than pitch, that it is a bit baffling that such an assertion could be taken seriously, but then again, exaggeration is a way to grab attention and it is provocative to claim that Axl Rose is the greatest vocalist of all time (he clearly isn't) and so mission accomplished if you're in the news business!
Interesting chart comparing vocal ranges of famous singers:
http://www.concerthotels.com/worlds-greatest-vocal-ranges