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
I wasn't around for a lot of these guys.
OF the music I listen to - ( obviously limited as I am lost with some of the suggestions )

Kenny Loggins
Steve Winwood
Freddie Mercury
Tom Waits.
Chet Baker.
David Bowie - the best all round singer, performer and innovator
Nick Drake - do yourself a favor and listen to him
Leonard Cohen - spooky spooky spooky
Elvis Costello - his voice is just amazing, and his lyrics ain't bad