Maybe you saw it coming, maybe you didn't, but the music world has seen a drastic change since the birth of Apple's iPod. Five years old on monday, Apple has forever changed the way we listen to music, the way we buy music, and the way music is advertised. Apple has seen enormous growth in its company because of the iPod, and rivals have yet to release a contender that can effectively steal iPod's thunder. Of course, Microsoft is not one to stand by and watch, as they are expected to release their "Zune" music player next month. Here's hoping we see more creativity and competition in the next five years.