Singers move the mic away from their mouth at the end of each vocal part, either by turning the head, pulling the mic away, or some other method. I’ve always assumed this was to prevent amplification of the sharp intake of breath between parts.
Now I wonder if my assumption is correct. I know there are many pros out in SDMB land, so I come to you for validation. 
Tell me it’s not simply a matter of style, like Elvis’ guitar.
Peace,
mangeorge
BTW; feel free to re-write that uncomfortable title for me.
This video may answer your question: Chocolate Rain
Perfect! 
Seriously considering a T-shirt.