The tunes were altered slightly to get them to sync up with eachother.
The PC tune is in the left speaker, and the Wii is in the right speaker.
Request a Cave Story tune, and I'll do a PC + Wii mix of it.

Comments: I made this tune slightly differently compared to my recent mixes, if you can spot it then you are a mega ear genius.
If you can't, then I'll just tell you.
The stereo tunes are usually only playing back half the song, not lengthwise, but widthwise.
...Uh, well sorta.
Pretty much the Wii tune was only playing what was coming out of the right ear of that tune, and the PC tune was only playing what was coming out of the left ear.
I changed my formula a bit, and made it so that each tune is playing both tracks.
Oh, and another thing, anybody notice the first half of the Wii tune sounds out of tune? It just really bugged me.
This was also looped a couple of times instead of once too, because the tune is pretty short.