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Only unsure about your Number 3's - Karen was OK but not great, to me, and I never warmed to that style of singing that Amy embraced - always sounded like Granny in the Beverley Hillbillies to me.
Worldwide, Aretha has to be well up there certainly, also Diana Ross and Tammi Terrell (whose early death may have been indirectly caused by her abuse at the hands of a very well known male Motown singer some regard as a hero.)