A few days ago i watched Searching For Sugar Man on TV. Missed the first few minutes but still caught it at the start. It's about an american singer / songwriter named Rodriguez who released one or two records in the early 70s, he failed and he "disappeared" . Meanwhile and for almost two decades he was the most famous artist in South Africa and his records the best-selling ones, more than Rolling Stones etc. Still no info was known about him there, only a photo of him on a cover. The rest of the world didnt know anything as well, actualy they never had hear about him. In SA there were stories about him suicide on stage and similar urban legends. When apartheid ended two of his fans started a search about him ...
Interesting story, one of these with no chance to similarly happen ever again, see : internet. Unless we one day learn about a N.Korea deeper than underground party culture ! No, no chance. Though it's possible there are some guys with an industrial band there, never able to record, just play for their own fun, hidden !