Mystery Of Bulgarian Voices

The Bulgarian State Television Female Vocal Choir, best known for their recordings Mystery Of Bulgarian Voices, is an internationally-renowned women's choir, based in and usually operating out of the nation of Bulgaria, specializing in traditional Bulgarian folk music. Joseph LoDuca, de facto music director of Pacific Renaissance Pictures And Television (the production company which produced Hercules: The Legendary Journeys and Xena: Warrior Princess) made extensive use of the choir's services during the production of Xena: Warrior Princess.

The Xena: Warrior Princess series theme is a development, by LoDuca, of "Kaval sviri," or "The Flute Plays," a traditional Bulgarian folk song which the choir originally sang on Le Mystere Des Voix Bulgares (The Mystery Of The Bulgarian Voices), to which it contributed heavily. The song itself was employed in "Unchained Heart," the Hercules: The Legendary Journeys installment which actually introduced Xena, to announce Xena racing into battle.