“It is Byzantine Chant sung in Latin. Think of Latin hymns sung by a Byzantine soloist, two or more singers, or a choir. Lycorgos Angelopoulos is a godsend as he finally sings the Latin hymns right because I have always wondered what the Latin would sound like sung by somebody with a thick Greek accent.This recording is similar to other recordings by the Ensemble Organum. The melodies are characterized by an ison(drone). Marcel Peres also does a fine job of singing Byzantine Chant in Latin even though he is not Greek.To me, this singing is THE original Gregorian Chant and what Gregorian Chant should sound like. The Gregorian Chant that most people hear and think of as Greg. Chant is actually the Solesmes style which is an interpretation of Greg. Chant and should not be synonymous with Greg.Chant. The Solesmes style is too polished and refined for early Christian chant and is therefore not historically accurate even though it is the official one used in the Latin rite(not Latin language) since 1850. Early Christian chant to me sounded more austere and ascetic and this recording along with the other Ensemble Organum recordings(Old Roman Chant, Beneventan Chant, Ambrosian Chant, etc.) proves that this is what Gregorian Chant really and originally sounded like.” – Customer Review on Amazon.com