Looking for good recordings of female vocals I have not yet tried...

Most of my listeing is female vocals and classic Jazz.  I have enjoyed current and older female singers.  I have most of Billie Holiday through current Diana Krall and Julia Fordham.  I enjoy good voices mainly acoustic.  It would be helpful if it is music I can sample online.  If the backing is mainly loud elctronic I would likely pass.  Thanks for your thoughts and experience.