Most unusual/mesmerizing female voice.

How about Ema Sumac, the "Peruvian Princess" who's heyday was primarily in the 50's when she was an international star with a 4-5 octave range. Whether you consider her voice mesmerizing or not, she is/was to her many fans. One thing for sure though her unique voice has got to rank up there with anyone in the unusual category. Then you factor in her beauty which makes watching her, whether a fan or not, much easier.

Kat Edmonson, I would add a you tube link but you'd be better off checking her out on Austin City Limits this Saturday, an encore presentation with Norah Jones in the first half of the show.

Molly Drake

(Nick Drake's mother!)

very similar to Nick in tone and content but with piano

Been on a Casandra Wilson fix for a while lately...

Yma Sumac's voice is mesmerizing. Yma Sumac's name was based on her mother's name, which was derived from Ima Shumaq, Quechua for "how beautiful!" although in interviews she claimed it meant "beautiful flower"; either way she was beautiful.

Enjoy the music.