She barely has a 5 octave range It s not impossible to have an 8 octave range which is currently the guiness world record for largest vocal range held by Georgia Brown G2 G10 is her range but I ve only heard G2 since her G10 is actually able to be heard and sounds more like a B8 or B9 Nicola Sedda actually has the largest vocal range that I know of which I only remember his highest as A9 The fact is that Mariah has only displayed a range of Bb2 G 7 which is very close to a full 5 octaves Bb2 has only been displayed in an interview and G 7 has been hit twice in live performances of Emotions and seemed fairly easily done Besides Bb2 she has hit C3 numerous times Emotions My All You And I live performance and other songs have C3 as their lovest Besides G 7 F 7 is her highest in the studio version of All In Your Mind