this isn't a post about the song/video, but about gangnam itself...this site has some nice pictures of gangnam over the years...it's amazing how much has changed just in the past 50 years...going from the poorest country by gdp after the korean war to 15th now
http://www.koreabang.com/2012/pictures/photos-document-gangnams-change-in-style.html
the site has a lot of other good pics about korea
http://www.koreabang.com/category/pictures