DRM is terrible, especially in its current form. At minimum, it prevents you from actually buying stuff(say in this case, a song). You just buy permission to use it how the company wants for as long as they feel like letting you. At it's worse, its intrusive and dangerous. Take securom and some of its predecessors for example(I.E. starforce). They force their way into the registry of your computer as deep as they can go, often without notifying you( EA is the worst culprit) and are not uninstalled even when the product is uninstalled. Often, they are incompatible with each other(even different versions of securom are incompatible). This can cause problems in the products, or maybe even the entire computer. And DRM doesn't work anyway. Why should people pay for something they don't truly own, when they can very easily get it for free and use it as they please. Just look at Spore, the most pirated game ever.
FTC Town Hall to Address Digital Rights Management Technologies - Event Takes Place Wednesday, March 25, 2009, in Seattle #539814-00183
FTC Town Hall to Address Digital Rights Management Technologies - Event Takes Place Wednesday, March 25, 2009, in Seattle