Le Mystère des Voix Bulgares (aka Les Voix Bulgares, The Mystery of Bulgarian Voices, Voix Bulgares - plus, formerly, Bulgarian State Radio and Television Female Vocal Choir & Bulgarian State Television Female Vocal Choir, Мистерията на българските гласове), is an all-female choir, formed in 1952. This naming is taken from the title of 1975 record, produced by Marcel Cellier - "Le Mystère des Voix Bulgares, Volume 1" - in which they featured