More female vocals

I am looking for some good female vocalist. I really like Etta James, Whintey Houston.
So, what other female jazz and blues singers can I look for.
As I am getting older my taste in music is changing.

Thanks Brian
Melody Gardot--one of the best singer/songwriters I've heard in the last decade.
I assume you already have Eva Cassidy, “Live at Blues Alley.” If not, that should be your next purchase.
I don't know if anyone has mentioned Ella Fitzgerald. If not,there can't be a discussion of the greatest jazz singers ever without her name being included. Her "songbooks" are classics and just about anything she'e done is worth hearing. There is alot to pick from.