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
Tierney Sutton (Dancing in the Dark is sublime)

Madeliene Peyroux

Shelby Lynne (Just a Little Lovin', now an all time favorite)

Ella Fitzgarld - all the "Sings _______ Songbook" great voice

Melody Gardot

Billie Holiday

Nina Simone

Frank Sinatra

Chet Baker (vocal album is OK, but the instrumental ones are just incredible)

Cassandra Wilson

Jane Monheit
Great list already - try also Robbie Williams' Swing when you are winning. Maceo Parker is worth checking out too.
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.