Careful with those Bluetooth headphones, a colleague of mine managed to pair her laptop with her speakers rather than her 'phones, and then promptly proceeded with listening to a (veee-eeery) adult audiobook.
Apparently, it can be quite difficult to determine whether the sound comes from your phones or outside them if you haven't turned the NC on.
Recent studies are mixed as to which has a more deleterious effect on creativity, the coworkers yapping or the heavy metal.