I need a female jazz vocalist. No Krall, No Norah

Patricia Kaas (french blues, chanson)
Meridith Monk (innovative vocal jams)
Lisa Gerrard (sophisticated vocal from Dead Can Dance)
Diana Schuur she's just for 'schuur'!
Flora Purim (latin fusion)
Cesaria Evora (latin fusion)
Sade (smooth jazz)
Basia (electronic fusion and pop)
Guesch Patti (mostly french rock but often with blues)

The latest one I've recently listened to and can't realy stop listening is

LHasa singing spanish in latin romance style.

The sexiest and the most attractive voice I've ever heard.

Any Holly Cole CD.

I don't think any of the above approach Shirley Horn (agree with you Newbee. Dianna Krall has a pretty voice. Shame she cannot use it like a jazz singer. With Shirley, if you are interested in subtle use of timing to twist and explore a tune fully, you will find her outstanding. If you just want a pretty voice, then perhaps look elsewhere. I agree also with Newbee on Tierney Sutton - again, someone that knows how to sing jazz, not just a pretty voice to sing ballads.

Amen Newbee !
Shirley Horn is IT.