A website called ConcertHotels.com has a list of what they have determined are the world's greatest singers based upon their vocal range.
We're talking the range between their highest and lowest notes.
With that, the world's greatest singer is Axl Rose from Guns 'n Roses.
He sings between (and you must be a music nut to know what this means) an F1 and B26. Of course, you already knew that.
Here are the top five singers:
1 Axl Rose
2 Mariah Carey
4 Steven Tyler
5 James Brown
See the rest of the list here