Oh cool Obake, only ones I (and I think most of us) know that you mentioned are Fin.k.l and Tasha, since Tasha is still around and Fink.k.l were insane huge and Lee Hyori is still around and huge.
You should pop into
PvM sometime though and talk to Fallen if you want to talk about really old Korean songs, we'll listen to stuff you link but won't really know much about them since most of them aren't around anymore! Though a bunch are still so we know about them
Fallen was stationed in Korea for a while back during GOD if you listened to them, I think they were around the same era, but he doesn't come here