Mariahs range is about BbG which is  octaves and  notes BbBb  octave BbBb  octaves BbBb  octaves BbBb  octaves and then  extra notes Bb from a vocal demonstration and G from Emotions live She has never sang lower than that She hits C in plenty of songs Emotions Youre So Cold My All You And I and another song which i cant seem to remember But from what I know switching from falsetto to belting in chest is considered difficult by other female singers