Jazz vocals recommendations please


My music tastses have become much more eclectic and I'm moving away from classic rock & pop & increasingly interested in jazz & progressive rock. Any suggestions re: well-recorded jazz with strong instrumentals, percussion and nice vocals? I've discovered Diana Krall & have most of her work. Patricia Barber musically nice but a bit too dark in mood for me (more like blues). Any and all suggestions welcome!!
klipschking
Nancy King "Live At Jazz Standard" with pianist Fred Hersch: the pure essence of jazz singing. Grammy-nominated 2-3 years ago, this album was recorded on the sly by Hersch. It documents King and Hersch literally meeting on the bandstand, no rehearsal. I would stand on Diana Krall's piano bench and pronounce Nancy King the world's greatest jazz singer.
Many great suggestions. I would add Karrin Allyson to the list, she is really top-notch.
Since I heard Freddy Cole on the radio, I've bought everything I could find by him. I can listen to him for hours.
Try Rio de Janeiro Blue on Telarc.
Second the Holly Cole and Tierney Sutton and, of course, the classics mentioned too, but the BEST piano jazz vocal has to be Shirley Horn, "You Won't Forget Me". Been using it for a reference for years. The sound quality is superb and the performance is here best (which is saying a lot).