I’m guessing that the compilation of old Cambodian garage rock easily qualifies as ‘least famous’. The first song ‘Jeas Cyclo’ is the one I remember best from there, of course. Of note is that I’m not Cambodian and don’t speak the language.

As for most famous, too much nineties’ europop music is guilty and nostalgic pleasure of mine to choose one song.

I also post somewhat obscure music in !music@lemmy.world — though I haven’t gotten to really shady stuff yet. My favorite little-known modern band is Mamaleek.