OFFIK: já se s tebou nehádám, jen říkám, že je to poněkud zavádějící označení...
Citace z toho linku, na který jsem prve odkazovala IKU:
When Rachelle Ferrell first gained popularity, some people attributed her "six and change"-octave voice incorrectly to her being able to sing through the sixth octave (C6-C7) and some "change," or a few notes in the seventh octave, instead of her being able to sing off the top of a grand piano