imported post
You could try one of the FM transmitters that you use to play the MP3 through the radio.
http://www.amazon.com/Prolynkz-PMA-002-Wireless-Digital-Transmitter/dp/B001CCXZUC/ref=pd_sbs_auto_4
http://www.amazon.com/Wagan-EL2516-SmartSound-Modulator-Transmitter/dp/B001B0X2QM/ref=pd_sbs_auto_5
You could try one of the FM transmitters that you use to play the MP3 through the radio.
http://www.amazon.com/Prolynkz-PMA-002-Wireless-Digital-Transmitter/dp/B001CCXZUC/ref=pd_sbs_auto_4
http://www.amazon.com/Wagan-EL2516-SmartSound-Modulator-Transmitter/dp/B001B0X2QM/ref=pd_sbs_auto_5