Why do rockstars (or popstars) look to the side after Singing their part?

Here's the examples... I don't know why they do this. To look cool?
Why do rockstars (or popstars) look to the side after Singing their part?
Why do rockstars (or popstars) look to the side after Singing their part?
Why do rockstars (or popstars) look to the side after Singing their part?
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