Ya Know, FWIW I gotta say I LOVED her voice!!!!
IMO, she could sing the birds out of the trees!
IMO, HER voice was as _SMOOTH as SILK_, yet _FULL_ in tone and not _THIN_ .
Her vocal timing, phrasing, and total feel for the song was and still is wonderful to me!
Look I grew up in Chgo., played guitar in the blues bars and I have heard/played with a good number of great players/singers/band leaders and have a great love for _ALL ROOTS_ musics, which she was not known for as a disco "Queen" but still IMO _That woman could sang_!!!!
IMO, THAT WOMANS VOICE WAS AS GOOD AS IT GETS!