This... this is so good. I hope this thread causes more people to post awesome unreleased music.
I'm pretty sure those were all made with GXSCC, a program that magically turns other people's MIDI files into your own original chiptunes. While the existence of a such a program will be a total pain if chiptunes ever take off on OCR, pretty much anyone with a good ear can pick out a GXSCC 'remix' within the first few seconds and I imagine none would make it to the panel. I personally don't think chiptunes should be discouraged just because bad, automatically generated ones exist. But hey, maybe it's OK, as long as legit chiptunes are secretly acceptable?