Most unusual/mesmerizing female voice.

Irene Papas and her performance on Aphrodite's Child's track Infinity from the album 666. If you have heard this it's unlikely to be easily forgotten. Definitely not my favourite track on the album but unforgettable just the same.

Lisa Gerrard of Dead Can Dance (most mesmerizing)
Elizabeth Frasier of Cocteau Twins (most unusual)

Kat Edmonson- Most Unusual
Hope Sandoval- Most Memorizing

Always liked the ex abba singer with “there’s something goin on”
always seemed eerie to me.

 The slight echo, at 2-3 am, ripped, always was eerie to me.
 Still a great song!

Dusty Springfield
Karen Carpenter