@Jessica Brandy? Really her upper register is nasally. Beyonce & Whitney has the same range, but Beyonce is more technical vocally. Beyonce could do things w/ her voice just like Mariah could do. Whitney was an outstanding vocalist but her greatest threat is her power & tone. Beyonce has range, power, stamina, and versatility, some qualities her and Whitney share. http://www.youtube.com/watch?v=jaN2TbWMvuw