For free of course. I should be an app for 3DS and WiiU. 30 plus years of soundtracks, bleeps and boops just playing at random or in some sorta categorized fashion. I thought about how it's taken Fox 20+ years to do a Simpsons marathon and thought well Nintendo has just as much musical content as any other game company ( it may even rival a few small indie labels) why not?.
I know for a lot of NES and SuperNES games the legality of rights and royalties could be a bitch but much like Virtual Console only Nintendo could put out a catalog out, lose half and still have enough content.
I'm in the kitchen, roasting chicken chops and BAM, out if nowhere the boss music from 3D World Runner plays...