Car mp3 players are not as uncommon as you may think. And if you think about it: where are you more likely to spend hours listening to music? In your car. If you don't have a car mp3 player yet, you'll want one before the end of this article.
Long are the days when you'd take your portable mp3 player, and connect it to your car stereo. You'd have a crude car mp3 player, but you'd have cables across the vehicle. Although you'd impress your friends by having many hours of music on a single CD, you would have to store the player somewhere it won't fall or it would slightly ruin the whole experience.
Of course it was just a matter of time until car stereo manufacturers felt they could make it easier for everyone: True car mp3 players were born. Now, your car stereo can also read mp3 CD's; and you don't need to mess around with cables, adapters, and whatever you needed to connect your portable mp3 player to your car stereo. If you match it with a multi CD changer, then you'll have tons of mp3 music at your fingertips, without the need to change the CDs ever again.