It resembles a Gregorian chant, but unlike most music of the time, it does not draw on the existing repertory.
This piece was written for feasts of the Virgin Mary
Plainchant
a feast day for the Virgin Mary... I think...
Gregorian Chants originated in the monasteries of Europe. They were sung in Latin, without any instruments. The chants were praises to God. Go to your local book store like Barnes & Nobel, go...
"Gregorian chant" takes its name from Pope St. Gregory the Great, who reigned as Pope of the Catholic Church from 590 to 604 A.D.