i'm pretty sure yma could have gone higher but she did hold the highest note i believe but only by a half step since the highest by opera singers was c her range is in fact octaves some singers inaccurately exploit their range mariah's is less than five octaves and as is yma's yma's lowest note is in the nd octave i forgot what note it is but it would have to be c for her range to be octaves which it isnt however they can stay since this category seems useless and not very well varified and misia's highest notes are like g 's or a 's