[header] How to play digital music files in your car [title] Play music while driving using a cassette adapter if your car stereo accepts cassette tapes. [step] Here are the steps that you need to follow. [substeps] Insert the cassette adapter into your car's cassette player. 
Plug in the wire from the cassette adapter into the headphone jack on your external device that can play digital music. Select and play the songs that you want to listen to.