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.
