Yes, Diamanda Galas is probably the most skilled of any crazy-vocal artists I've heard, a style I explore myself. She often has religious themes in her work and is heavily inspired by speaking "in toungs."
For those who aren't so into the noisy stuff her newer works are very VERY dark piano and voice songs.
Loc: United States
Here’s a live rendition of her cover of “I Put a Spell on You”, originally released on her album “The Singer”, from around 1991. I saw Galas live in the early 90s in Chicago for that tour; just her and a piano, and her performance was more than powerful enough to carry the entire show alone. The video seems fitting for Valentine’s Day.
We saw Diamanda in concert a couple years ago. Amazing stuff. She had just come out with Guilty, Guilty, Guilty at the time. She didn't do Litanies, but we recognized some stuff off Malediction and Prayer. It was just piano and haunting lyrics. Almost trance like at times. She plays short sets, but the intensity more than makes up for it.