заметила -
у Amy Lee превосходно получается звук [ai]:
I'm going under.../
I know the truth now
I know who you are/
Suddenly I know I'm not sleeping
Hello, I'm still here/
I pulled away to face the pain
I close my eyes and drift away/

и так далее.

а у Joan Red потрясающе получается звук [oi] и [o]:
Cause I can't go on alone
I need you
Sorrow is all I own to breathe through
Caught in your heart of stone
Before I write my own
And to get myself throug/
Nothing but fear, the light in your eyes I know
I know...