Every once in a while the mainstream will flirt with some of the indie groups, sometimes some of the style rubs off and the Pop industry will change.
One very well known case (in Korea) http://en.wikipedia.org/wiki/Seo_Tae_Ji basically revolutionized the entire industry a couple of times, changing styles like some people change hair cuts. He basically introduced hard rock and rap into the mainstream (which basically was stuff like this https://www.youtube.com/watch?v=w2lD9cvkDx8 ) until he came along.
But there's really some great stuff in the indie scene there. One duo has recently started getting noticed a bit in the mainstream.