Overview
MCMXC a.D. starts with the mellow sounds of a foghorn, later on to be known as the "Enigma horn" and the voice of Louisa Stanley, who at the time was an executive at Virgin Records speaking in "The Voice of Enigma". The Gregorian chant "Procedamus in pace!" then segues into the first three-part movement of the album even before it starts, "Principles of Lust".
The first part, "Sadeness", received the most attention through its unique and previously unheard mix of Gregorian chants and dance beat. Triangles and synthesized shakuhachi flutes add to the French vocals and breathy sounds of Michael's wife, Sandra. Cretu only describes the male voice speaking in French in "Sadeness (Part I)" as a good friend of his. The song fades into "Find Love", in which Sandra instructs the listeners to follow their lust. Reversed chants signal the start of "Sadeness (reprise)" and continues with a short piano piece, based on the same tunes as the shakuhachi flute earlier. The flute returns as chants of "Hosanna" gradually bring an end to the movement.
The next song, "Callas Went Away" is a tribute to the opera singer, Maria Callas. Chirps from electronic birds at the beginning, mixed with a slow beat and sounds of a piano leads to Sandra's whispers and ends with some samples of Callas singing the aria Ces lettres, ces lettres from the opera Werther by Massenet.
The rain at the beginning of "Mea Culpa" is a sample taken from the introduction of Black Sabbath's self-titled album and song. The plainsong chant "Kyrie Eleison" (from Mass XI, Orbis Factor, in the Liber usualis) appears predominantly, alongside Sandra's vocals and the same flute. It fades into the experimental track, "The Voice and the Snake", which is based on "Seven Bowls", a song from Aphrodite's Child where a group of people describe the end of the world in an eerie and haunting manner, as mentioned in the Book of Revelation.
A bowl falls to the ground and breaks, leading it to "Knocking on Forbidden Doors". The drums beats in the song made to resemble the sound of a door being knocked, before it progresses into a faster beat. A guitar enters and slips aside quietly for more Gregorian chants, this time a part of "Salve Regina", and fading into the following track.
The second three-part movement in the album, "Back to the Rivers of Belief", begins slowly with John Williams' five-toned notes from Steven Spielberg's movie, Close Encounters of the Third Kind, which leads to mellow Gregorian chants in the first part of the movement, "Way to Eternity". The same beat from "Sadeness" enters for the start of "Hallelujah" as the strong sounds of violins accompany the beat. The triangle and voices from the first track reappears and repeats itself. An Orthodox/Byzantine chanting style is apparent in this part and segues into the next part, "The Rivers of Belief", the only track where Michael Cretu sings in the album. After Cretu sings the chorus, the music stops completely and an unfamiliar male voice intones Revelation 8:1: "When the Lamb opened the seventh seal, silence covered the sky". This is also sampled from Aphrodite's Child album 666 (the voice here is of John Forst). The sentence about the Seventh Seal enters at the 7th minute and 7th second of the 7th track, although in some pressings, it appears at the 7th minute and 17th second. The music resumes with the shakuhachi flute and Cretu's vocals. The album ends with the falling star effect and the "Enigma horn".
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