Male Jazz singers - any recommendations?


I have a great appreciation for female jazz singers (Sarah Vaughan being my favorite). But when I was listening to a Horace Silver cd, lately (BTW: the RvG edition and some others are on sale right now at Towers for 9.99$), there was a male singer on the last track and it suddenly struck me, that I was completely oblivious of male jazz singers so far.
Now I'm looking for some recommendations. The Kind-of-Blue/My-Favorite-Things/Koeln-Concert-type of male jazz singer performances. Any suggestions are very welcome.
pipetman
Jazz is hard to categorize, but I like Johnny Hartman,Joe Williams and Ray Charles. Good listening.
Can't really think of too many. Lots of blues singers that get close to jazz, but blues is not jazz. For real jazz, Bobby Short comes to mind, with his distinctive style. How about Harry Connick Jr? Is that jazz or just good crooning? For that matter, some of Frank Sinatra's and Tony Bennett's work was actually pretty much jazz, but it was so distinctively their own that most of us don't identify it as real jazz. I've probably missed somebody real obvious. Go figure.
Check out Kurt Elling, Nat King Cole (Trio only) and early Louis Armstrong. Mr. Armstrong virtually invented jazz singing (just ask Billie Holiday).