Go to Club Nintendo
If you are anything like me, you put off registering products on Club Nintendo until months (or years) later, when they aren’t worth as much. If you bought both the 3DS and the Wii U versions of Super Smash Bros. and you haven’t yet registered them with Club Nintendo, then today is the day to do it.
Registering both versions nets Nintendo fans a free two-disc soundtrack. Time is running out though. Today is the last day to do it. These should be shipping out some time in March of this year. How else are you going to get free music in this day and age?