Best Male Singers of the 20th Century


There is an interesting current discussion about the best female vocalists on CD. I have my own ideas about the best male singers (any category) of the 20th Century, but would like to hear other opinions.
sdcampbell
Tom Waits - i could go on and on why i think he's the one but i'm too tired to keep typing.
Kubla, Dekay, remember "Nighthawks @ the diner, Emma's 49er, a RdV of strangers..."?
T. Waits when I was still young(er)...
Cheers!
Only able to comment rock, but obviously people need to listen to Glenn Hughes. How can you compare without hearing? Of course this is all subjective isn't it??