Who are your three favorite female singers?

I have favorites, but would like to hear from others.  Thanks
jachan,  June Christy is like a great glass of champagne....perhaps a bad comparison. 

@whatjd. I think a VERY good comparison. But there are so many great female vocalists, and my favorites vary over time.

Except Donna Jean.
At this time my three favorite female vocalists are:

Diana Panton
Monica Salmaso
Sandy Stewart
@tyray  Yes, she was a phenomenal singer.  Marian Anderson was comparable as a Black spirituals singer (American folk) as well as an outstanding opera and classical recital singer.  
@whatjd I have 7 LPs and 11 CDs (some double LP sets) of June Christy.  I guess she is second to Ella in my 50's-60's female jazz collection (Ella-17 LPs and 15 CDs).