Why do some singers raise their eyebrows when singing high notes?

AcesHigh

Hi

Why do some singers raise their eyebrows when singing high notes? I tend to do it when im singing in mixed voice.

Wigs

Could be a physiological thing, since as you go higher you also tend to smile a bit more if you are trying to keep the sound bright.

MattGee

I don't know, I myself tend to mimic the emotion of the phrase. Everbody's got their quirk