Roadwave — In-Car Music Player with 3D Audio

Roadwave puts a music player in the car you are driving. It is a screen in the cabin, placed and sized where you want it, playing files you already have on your disk. The sound comes from the car, not from you; it goes quieter and duller with distance, the way music from a parked car actually does. Nothing is built into any vehicle, so it works in every car in the game, including modded ones.