Old roman chant
Definition and background:
A collection of old liturgical chants dating from the 11th through the 13th centuries. The tradition may date to the 8th century and includes what is known as Gregorian Chant.
For more information on the music term "Old roman chant" check out these other resources:
Wikipedia - Glossary of Musical Terminology
Virginia Tech Multimedia Music Dictionary
ORB -- Medieval Music Glossary