Original: Composer Joseph LoDuca wrote the theme music and incidental music, and co-wrote the lyrics for the songs in "The Bitter Suite". The theme music was developed from the traditional Bulgarian folk song "Kaval sviri", sung by the Bulgarian State Television Female Vocal Choir.
Simplified: The theme music, composed by Joseph LoDuca, who also co-wrote the lyrics for the songs in "The Bitter Suite", was developed from the traditional Bulgarian folk song "Kaval Sviri", and was sung by Le Mystere des Voix Bulgares.