Apple, Microsoft and Google are in an epic battle fought on many fronts. At stake is nothing less than the control of our computer, cell and gadget operating and delivery systems, as well as, how we discover, purchase and consume… just about everything.  On the surface music represents a just a tiny corner of hat battlefield, but take a minute to look at this chart by Shane Stone of Gizmodo and you'll see how many portions of this battle effects music creation, discovery, marketing and consumption.