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In my opinion Karen Carpenter had the best female singing voice of all time.

Two that sound like the aforementioned cat on certain notes....Great, yes...Best of all, not IMO.As a musician myself I can't deny Karen had a great voice, but I really think Linda Ronstadt has her beat. Also Nancy Wilson, and a whole slew of black female singers as well, especially Sade.
In my opinion Karen Carpenter had the best female singing voice of all time.
With all of the amazing talent that we have been exposed to musically, I cannot honestly say there is a GOAT or Best artist. Only that I am thankful that I have been exposed to these wonderful artists.Easy pick.
IMO, calling any woman the "best vocalist" involves them being able hit all the notes, without sounding like a cat with its tail squished by a rocking chair on certain notes.....Karen fills that bill.
Others I'd put in that league: Aretha Franklin, Lena Horne, Ella Fitzgerald, Cass Elliot, and the B-52s duo.