|1.||Personal Walking Theme Music|
This is heard when someone's MP3 player, on their cell phone goes off in their pocket or purse, most usually unbeknownst to them, and they are now walking along with their own music playing out loud, like an individual's theme music in a movie or TV show might have.
Mary should be here any minute.
How do you know?
I hear her Personal Walking Theme Music, oh, here she is!