Best jazz or blues female vocalist ever


Hello, I'm looking for some recommendations for a female vocalist (blues or jazz) from before about 1965. I think that Ella Fitzgerald and Billie Holiday are contenders for "best". Could I get some recommendations of vocalists? Also, what works would you say is their best effort? Thanks in advance.
talon4
Sarah Vaughan, Ella, and Anita O'Day really do it for me. Carmen McCrae is also great.

I saw Anita O'Day a few years ago at the Iridium on Broadway, NYC a few blocks from where I live. Being in her 80's it was not the greatest, but I was thrilled to see her and there were a few moments when her old magic shone through. I never realized she was still alive.