From Youtube: Beneventan Chant

Beneventan chant is a liturgical plainchant repertory of the Catholic Church, used primarily in the orbit of the southern Italian ecclesiastical centers of Benevento and Montecassino, distinct from Gregorian chant and related to Ambrosian chant. It was officially supplanted by Gregorian chant in the 11th century, although a few chants of local interest remained in use.

Here is a sample of Beneventan Chant from Youtube: Otin to Stauron - O Quando in Cruce, sung by Ensemble Organum in Greek and Latin, from their album, Chants de la Cathédrale de Benevento: Semaine Sainte & Pâque.

What is interesting is that three bilingual (Greek and Latin) antiphons, of this is but one, were sung in Benevento and some other Italian centres as part of the Adoration of the Cross service in Holy Week. Some of these chants seem to have Eastern origins: this particular sample for instance, found in sources from places such as Benevento and Ravenna, is actually a version of a Byzantine troparion which can be followed back to the rite of Jerusalem in the 7th century. Its presence in Ravenna should mean that it was already used in the liturgy there before the fall of the Exarchate of Ravenna to the Lombards in 752.

Old Roman Chant

Ever heard the claim: "Pope Gregory the Great came up with Gregorian chant"?

For centuries, it has become common wisdom that the venerable pope was the source of what we now know of as Gregorian chant, and the assumption that it was the chant tradition of the Roman Church - apparently the sole one - was a given. Many - scholars and laymen alike - repeat this attribution, often without question. However, certain discoveries in the 19th century (which were not given proper attention until the 20th century!) has shook the foundations of centuries of pious retelling.

Oratio Jeremiae Prophetae

A piece of Mozarabic Chant: the Prayer of Jeremiah the Prophet (Lamentations 5:1-11).