Most likely do to the music.

A suggestion for you; it's always a good idea to turn the music down anywhere you are going to park; whether you have a expensive sound system or not. People look out for things like this and wait and follow. Just like with rims; people will follow you home and see where you park with bad intentions. I've learned my experiences and so has a few of my friends. I've seen hoods popped just to get a new battery. I've seen numerous cars on bricks. And of course numerous windows broken.