Set a location and choose your song. Once you are within the location's radius, your theme will start playing.
Show your friends you really are a superhero by having your theme song play when you enter a friend's house.
Play a song when you arrive home from work for a little pick me up or to get the kids running to greet you.
Prove you're the ultimate music professor by having some Beethoven announce your arrival.
You can make several GeoTunes so that no one misses the awesomeness that is you.