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
Rudy Valle,Woody Gutrie,Elvis,John Lennon,Robert Plant(meet twice),Mick Jagger,Micheal Jackson,Hank Williams,Bo Didley,BB King,Willie Nelson

All created styles that changed the face of music for their particular decades.There are a few more that escape me at the moment,one is a blues singer that only made a few recordings.Really bugs me that I cannot remember his name at the moment.Made a recording in Angola Prison.
Joao Gilberto. Miles Davis said: 'he even sounds good when reading the newspaper'