I'm not actually sure that Valve has solved that problem. I don't follow the video game industry very closely but a little googling turned up some articles clai

I'm not actually sure that Valve has solved that problem. I don't follow the video game industry very closely but a little googling turned up some articles claiming that game piracy is on the rise and represents a real threat to the industry...whether those are remotely accurate or not, I can't judge. It certainly wouldn't be the first time an industry made a lot of noise about how terrible everything is while actually thriving, so let's assume for the sake of argument that Valve has largely solved game piracy. I don't think the two are directly comparable, given that playing a game necessarily requires running code and games can easily require an Internet connection these days, in fact it seems like more and more popular games are online multi-player types. It is significantly easier to make it too hard to be worth pirating a game, so I would argue that Valve offers some nice carrots but the sticks are sufficiently pointy. Meanwhile, with music, all you need are the bits or the sounds which you can then turn back into slightly lower quality bits, I don't think there is a reasonable means to make pirating music more difficult.