In reply to Stephy.

I agree partly with what you say, but mariah does not have a real head voice, its all falsetto, Beyonce on the other hand has a real head voice, and does not have a falsetto and what I mean by that is that she does not has a whistle registry such as mariah and tamar. and for the record whitney does not have a wider range than the three, but she has the stronger voice, just research it, and I am a fan of all three ladies for the record.