[Vocal Training] Why does a "key you can sing comfortably in" sound better? The truth about vocal "overtones" and the secret to choosing the right key

A suitable key that you can sing comfortably in resonates with "rich overtones" better than an original key that you struggle to reach.・Overtones are sound components that layer on top of the ...

When you're confused, thinking, 'Do I really sing with this vocal exercise voice?' - Voice Training Notes for Those Struggling with Their Voice 21

Huh? Am I supposed to sing with this voice?''It's different from the image I want to sing with...''That's not the kind of ...