Your favorite male soul voices

My favorites:   Marvin Gaye
                        Luther Vandross
                        Ronald Isley
Listening to Traffic now so another vote for Steve Winwood.....from the time he was 16 years old!

But when I consider all of these I keep coming back to Sam Cooke. There is so much depth, richness, smoothness and ease. 

And I think one of his best is Bring It On Home to Me with Lou Rawls singing back up. The timing and interaction between them is incredible.