On the topic between PRC and DPRK (and in this case, related to RoK as well), PRC has now claimed that some Korean folk songs (including the famous Arirang) is developed by the Chinese:
Ostensibly, this revision is to protect the Korean-speaking minorities in PRC's northeast region. However, it will be more credible if there is
proof that it was these minorities that developed these songs. Otherwise, it looks more like a revisionist attempt that is not in line with the "peaceful rise" rhetoric (maybe it is just rhetoric?).