In reply to Xyz.

Yes, I would say Adele too. It's their tones that make them instantly memorable on record, not just what they can do technically. I would love to hear what Mariah, Xtina and Adele might sound like with Beyonce's voice care discipline. They are gifted vocally in a way that Beyoncé isn't so she works 10 x times harder to preserve what she has in order to stand next to the greats for technical merit alone, if not vocal specialness.