There are ways to play MP3s in your car stereo even in older cars with only cassette players or CD players.

Cars with cassette players you can buy this special cassette with a wire coming out of it that you plug into a MP3 player or smartphone. Click here to buy this special cassette

Cars with CD players you will buy a fm transmitter to over ride the signal on any given station. Connecting your MP3 player into the transmitter.

Click here to buy this transmitter

For directions to download using only a mobile device click here.