Cher, Aretha Franklin, Celine Dion and Christina Aguilera; best voices ever?

How could you forget Mariah Carey?! Her voice has went through some wear and tear over the 20 years she's been a singer but in her early to mid 20s, she was PHENOMENAL when she started off. Only a few pop singers possess a 5 octave range and to top that, can switch between registers as elegantly and flawlessly. And she has something those singers in your list don't have and it's a whistle register :) But I gotta admit, you know your divas and legends and superstars. Mariah will always be my baby though haha :D