it's not the same

I've had my iPod for about a week but today I spent some time in the car with my music cranked and the windows down. When I am walking to school with the iPod on, I really do feel like those commercials where the guy s walking all normal, but his shadow is dancing & rocking out etc. I thought it would substitute for listening to music in my ca, but it doesn't - they are two totally different phenomona.