no singers here i guess she may well have a octave range but singers are defined by their effective range not merely the pitch boundaries of their natural range including the falsetto however carey is a phenomenal singer regardless of her full range hell i have a range of over three octaves but i'm only effective in slightly under two i e i can really only sing in my effective range i can reach the outer limits of the larger range but i can't sustain pitch accuracy or handle any considerable length of melody again regardless of her range she's proved many times over that she is effective in most of her range vision of love remains one of the most remarkable vocal performances i've ever heard i'd love to hear her sing some of hildegard von bingen's music she's probably the only popular singer who could actually do it with ease btw billie holiday was one of the greatest singers yet her full range not broad some say only about an octave and a half and she packs more meaning and soul into her renditions than most better endowed voices range is no determinate of anything but boundary conditions the real news is what gets done within the given range of course again i think mc is simply phenomenal in that regard oh one word more re range and i'm gone captain beefheart is also said to have had an enormous vocal range i love his music too but he was no mc