> Headphones(or headsets, even the ones with only one earpiece) serve
> in studio the role that those large wedges do on-stage in concert.
> They are monitors. So my theory is that the singers clamp the headphones
> so their own voices don't bleed through the headphone padding during
> high/loud notes.
But presumably they are already hearing a distorted version of their own voice
through direct conduction in their heads, so would that really help?
Just from looking at it I sometimes get the impression that it's an
affectation, done just to look good on screen. If it really served a purpose,
wouldn't you want to hold both sides of the headphones (I've seen this, too,
but it looked more "sincere").
I saw a film of Keith Moon playing with headphones apparently duct-taped to
his head. I couldn't figure that out, either.