North Korea is one f-ed up country. Citizens are required to have a radio, but the only approved units tune only to North Korean radio stations. Attempts to listen to foreign broadcasts are, er, strongly discouraged lest the populace be exposed to ideas and concepts contrary to that of the Dear/Great Leader.
In November 2017, a hacker known as The Jester managed to break into a North Korean broadcasting facility used by the Pyongyang Broadcasting Station (known as–and I’m not kidding–Pyongyang BS) in the city of Kanggye, 185 miles north of the capital and along the border with China.
This particular facility was chosen with great care. Broadcasting at 621 and 1053 kHz (AM radio frequencies), 3250 and 6400 kHz (in the shortwave band), the station is used for alerts about nuclear tests or emergencies.
The Jester, who previously broke into jihadist websites and eve messed with the site run by Russian Ministry of Foreign Affairs. For his North Korean trick, he set it up so this song ran on repeat. Well done, son.
If you want to hear a recording of the broadcast, go to Digital Music News.