There is no one answer, as that depends entirely on each person's individual musical tastes.
Alternately, you could credit Aslan the Lion, from C. S. Lewis's Chronicles of Narnia, who (in The Magician's Nephew) literally sang the world into being... making him pretty much by definition the Greatest Singer.
The World's Greatest Gospel Singer was created on 1955-03-14.
American Singer, Pianist, and Singer-Songwriter
Yes, probably
Toby Keith is the greatest country singer of all time.
The greatest singer known to man.
Sabbie is the world's greatest pop singer
David ruffin
Becoming a singer
Yes he is by far!
Being the greatest singer in the world :)
tony bennett
Freddie Mercury (a.k.a. Farrokh Bulsara), the lead singer of Queen