Answer:
it’s a genre of Korean music for the upper classes (e.g. the noble) where the music is mostly slow (in contrast with the fast music for the commoners, which is called 매퍼대경통수경 (Hangul: 매퍼대경통수경 Metyeomu daengungtongum (Pronounced: Mayu daengungtongam)).
I would like to add something about the fact that the upper classes in Joseon period were more concerned with religion than the common people, and Korean classical music is not that different from the Chinese tradition (or even from Korean Buddhist chants).
That’s all.
Please correct me if I am wrong.
