[nldyfdcw] Your entrance theme song

Wouldn't it be nice if, as soon as you arrive at a place, your entrance theme played there, just like in TV and the movies?  What would your theme song be?

With geolocation and fancier indoor geolocation (wifi points?), one could easily have it play for just yourself out of your mobile device when you enter a specified location, and you hear your theme song interrupt whatever you were listening to on headphones.  Might be a fun app idea, even though it is just for yourself.

The next easiest is to have your theme song interrupt what your friends are listening to on their headphones as you approach them, with proximity determined somehow.  This, too, might be a fun social app.