The very best remix of Gangnam Style was done Steve Streza. It seems
the video was yanked from youtube due to copyright issues, but the
audio files are still available on his site.
Listening to this, and I'm rather disappointed I'm missing out on the accompanying video.
I wonder if Youtube will reverse course on this, given that Psy has made it clear he has no interest in enforcing that copyright (a decision which is clearly in his best interest, too).
http://stevestreza.com/2012/09/08/so-i-made-a-mashup
Although the mixed audio alone is great, the video mixing was also fantastic. The whole thing was discussed here on HN:
https://news.ycombinator.com/item?id=4493280