HOWEVER.. If the music was split left and right from virtual in-game speakers and you could walk away from your vehicle and hear it as you wonder on foot that would be wholly better.
Ohh, you are right, it could be really nice
Especially with the binaural audio.
BTW, here is the video I was talking about (Mig engine sound is Nyan Cat, I managed to break Uriah mental sanity with this one):