Mariah s range is about Bb2 G 7 which is 4 octaves and 5 notes Bb2 Bb3 1 octave Bb3 Bb4 2 octaves Bb4 Bb5 3 octaves Bb5 Bb6 4 octaves and then 5 extra notes Bb2 from a vocal demonstration and G 7 from Emotions live She has never sang lower than that She hits C3 in plenty of songs Emotions You re So Cold My All You And I and another song which i ca nt seem to remember But from what I know switching from falsetto to belting in chest is considered difficult by other female singers