I agree. She had a tone that had so much depth.
Her version of “Superstar”, that starts in a lower register, still nails me 50 years later.
I use to sing her songs when I went to Keroki because my voice teacher said I sounded like her. Her range was very comfortable as were her songs. Had a lot of fun doing that as the Host had a fabulous system....rew a good crowd who appreciated good singers.