Best jazz or blues female vocalist ever

You need to hear SHirley Horn album,Here`s to Life.You are
missing out on a real gemm.

Thats a hard one to answer because at any given time a female singer with any good material will move you. But if I had to I would say Ella,Vaughan,Bessie Smith and Kelly Smith,Holiday and Washington. There are more just to early in the morning. Also try some Lena Horn not a true Blues or jazz singer but a fabulous voice. I guess we have to stick to he old standards becaue your not going to find them on American idol.

Sarah Vaughan with Ella a close second

I'll second Rayhall's & IMO, her best was Clap Hands Here Comes Charlie -- EXCEPTIONAL!

You could also look for Carmen Lundy and Carmen mcrae and have a listen.