I just ran across this little article about a Western musician who has played in some unusual locations around the world, including in North Korea. Kind of an amusing story.
While I linking there, I should note that Koreanpop.org is a pretty good website, not so much about pop music as the interesting stuff. There are a whole bunch of articles translated from the Weiv Korean music website, interviews and more.
Also worth a read is Inter-Asia Pop, which is a more scholarly look at music around Asia, with a lot of Korean stories.