Bulgarian State Television Female Vocal Choir
The Bulgarian State Television Female Vocal Choir is a Bulgarian musical ensemble that performs modern arrangements of traditional Bulgarian folk melodies. It is best known for its contribution to Marcel Cellier's Le Mystère des Voix Bulgares (The Mystery Of The Bulgarian Voices) project, for which it was awarded the Grammy Award for Best Traditional Folk Album at the 32nd Grammy Awards in 1989.
Source: Wikipedia — Bulgarian State Television Female Vocal Choir (CC BY-SA 4.0)