If you have never listened to Bulgarian choral music, you are missing some of the most amazing stuff out there. The vowels are quite a bit brighter than Western ears may be used to, but the laser-sharp intonation cuts right through to your soul.
Kaval Sviri
Bulgarian State Radio & Television Female Vocal Choir
https://youtu.be/zt0RsBxWMmc
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@voltronic If you like that you may also like Varttina, the Finnish girl group. https://www.youtube.com/watch?v=l9ozxHOXf8I
@Boyceaz
Whoa, really cool. I had not heard of them.