Certainly,
Lisa Gerrard, ( IMO the most spectacular voice ... Sanvean is extraordinary ... among many many others ... )
Elizabeth Fraser, ( little exercice: on Youtube listen Song of the Siren from Brian Ferry then, from Robert Plant, and after, see what Liz can do with the same song ... Unbelievable! )
Susan Janet Ballion, ( S.he's S.o crazy ! - I love it! )
Montserrat Figueras
Sofie von Otter ...
also very good:
Sinéad O'Connor,
Sarah Mc Lachlan,
Grace Slick,
Dolores O'Riordan
Catherine Ringer,
Kate Pierson,
Norah Jones,
Karen Orzolek,
Beth Gibbons,
Azam Ali,
Liquid voice category:
Nana Mouskouri,
Karen Carpenter,
Ella Fitzgerald,
Édith Piaf,
Klaus Nomi ...