I love jazz and blues, but I tend to like the really old school stuff by female jazz vocalists.
Sarah Vaughan, Lena Horne, Billie Holiday (Music warning:
Summertime is my ATF...reminds me of New Orleans, and I loves me some N'awlins...
They Can't Take That Away From Me is also one of my fav's), Ella Fitzgerald...newer stuff, I like Amy Winehouse even though she's bat shit crazy, and Norah Jones. Those are just the ones I could think of off the top of my head, although they are not very guitar-ish.