I got to thinking ; which mainstream female singers had a purity of voice and those "special" qualities of grace and class which you remember forever.
My top five, and I wouldn't presume to rate them in any order, would be:
Judith Durham (look at her other videos on Youtube)
Is it just my age that says I can't think of any popular singer who would come close?
Perhaps Charlotte Church and Hayley Westenra, but they are nowhere near as wildly popular as the above five goddesses!