This quartet is called the Alborada Quartet, and they recorded some music in the 1980s. I’ve been able to find out virtually nothing about them. But they sing acapella quartet music, in Korean, like you’ve never heard it sung before.
Close your eyes and just listen to this blend:
Now take a listen to this arrangement of the black spiritual “No More Sorrow.” I know they are borrowing it from another incredible and little-known quartet called Breath of Life who had a television and radio ministry in the 1970s.
I sure wish I could obtain that project somehow.