Here is an article reprinted from USA Today regarding the "greatest" rock and roll vocalists ever and their alleged ranges:

Take that, Mariah Carey. Turns out Guns N’ Roses frontman Axl Rose has the greatest range of any singer, ever. That’s according to some sort of study conducted by travel website Concert Hotels.

So how’d they determine that Rose is No. 1?

“To create this piece, we took the 100 Greatest Singers of All Time as compiled by Rolling Stone magazine in 2008. To this list, we added some of today’s top singers including the nominees for top male and female artist at the Billboard Music Awards 2014. We cross-referenced the resulting list with vocal range data curated by The Range Place. We included all of the singers on the list for whom the data was readily available.”

As Death and Taxes points out, “The site cited an oft-debated 2008 list from Rolling Stone and cross-referenced it with an internet message board.”

Website:
http://www.concerthotels.com/worlds-...t-vocal-ranges