This is a fun article from back in December…
My Headphones, My Self - NYTimes.com:
You see them on every block: people being propelled through their routines listening to their own individualized soundtracks, with the outside world serving as a stage set.
Headphones are now fashion statements. Status symbols. Fetish objects on par with luxury watches and limited-edition Nikes.
I also liked this quote:
“Headphones are the front line of urban social defense,” said Julie Klausner, a comedian, actor and writer. “I’m introverted and socially anxious by nature. My worst nightmare is sitting next to someone on a plane or someone who wants to strike up a conversation on an elevator.”