Thanks for bumping this, I'd forgotten to dig through for more goodies.
I was trying to find the actual Pilentze Pee track from Le Mystere Des Voix Bulgares, which VAST sampled for the song 'Touched', but this is the London Bulgarian Choir performing it:
Unfortunately, I can't seem to find a recording on Youtube, but this is Mohammad Reza Shajarian's "Language of Fire". It's very much worth listening to.
I'm not sure if this counts, but Helium Vola is a German group that combines a classically trained composer and a classically trained vocalist; they take early music (most of their songs are from scraps of poetry in Old French (langue d'oc and langue d'oil), old German, old Italian, Latin, etc.) and make/rework the music for it. One of my favourite bands. Her voice fucking murders me.
You could probably also make a solid argument for Peter Gabriel's soundtrack to The Last Temptation of Christ as being world music:
Thank you, I used one of the examples you had here to find a song to review. Very nice music, the vocals blow me away.
Interesting fact: Even though they're Icelandic, the singer isn't singing in any proper language. They take Icelandic syllables and sounds and merge them into the context of the music. It's kind of like scat singing in jazz, but done in a significantly different and more complex way. The fans call it Vonlenska or Hopelandic.