have you heard of cocorosie? strange, experimental, haunting-ish music. i can't really think of anything to compare it to although there are parts when one of the voices sounds a little bit like bjork. worth a listen, i've heard the adventures of ghosthorse and stillborn album, that b loaned me.
cocorosie is an american musical duo formed by sisters sierra rose casady ("rosie") and bianca leilani casady ("coco") in 2003. stylistically, they may be assigned to the indie rock or psych folk genres, and are sometimes associated with the new weird america (or freak folk) movement; additional influences include hip hop and opera.
sierra mainly plays the guitar, piano and harp, and contributes vocals. bianca sings and manipulates various children's toys/electronic & percussion instruments. cocorosie performs as a duo and also with other backing musicians on occasion, usually a bassist and either a drummer or beatboxer. -wikipedia