They can't enforce that with music, it's beyond their control. To be able to control that they'd need to be able to restrict access to electronics components, restrict access to electronics education, confiscate all existing audio recording equipment, restrict access to purchase audio recording equipment (including equipment for musicians and the TV/film industry). Furthermore, once the music is DRM free, you'd need to be able to monitor the sharing of citizens around the world, not just through the Internet and private computer networks but through Sneakernets as well (an example of an effective sneakernet: http://www.fastcompany.com/3048163/in-cuba-an-underground-ne... ).
So with all this in mind, what's the point? Those who want DRM-free music are going to be able to get it and hide it from the authorities, and it'll have minimum to no effect on the industries it was designed to protect, and possibly backfire if enough people choose to resist the restrictions.