When there isn't a sidewalk for goodness sakes walk on the left hand side of the road facing the oncoming traffic! You want to see the car that's going to hit you and be able to jump out of the way. If it comes from behing you won't see it!
Of course I know it's possible they drive on the other side of the road where you live but the truth still remains - face the oncoming traffic for your own safety.
Now about those head phones-seriously! We won't talk about hearing damage today but vulnerability. I really am not a fear monger but really sister - the rules of personal safety say 'keep your eyes and your ears open' and how can you do that when you are moving and grooving and just not present with your ears covered and most likely texting as you walk along ? H-m-m-m-m-m-m-m ?