Who are your three favorite female singers?

Well many of my older favorites have already been mentioned (Annie Haslam - but no Jane Relf?? - Jennifer Warnes, Natalie Merchant, Sarah McLaughlin, Mary Black, Loreena McKennit, Sandy Denney etc.) but some big ones are missing:

• Bonnie Raitt - I mean "Angel from Montgomery", seriously
• Maddy Prior from Steeleye Span
• Karla Bonoff
• Grace Slick
• Joan Baez

But, with the exceptions of Anneke Van Giersbergen, and Amy Lee, all the great symphonic metal singers were ignored like, in no particular order:

• Simone Simons
• Tarja Turunen
• Dianne Van Giersbergen
• Sharon den Adel
• Floor Jansen
  

Really, how can anyone pick just three?