This Old Roman chant is from the 6th century, when Saint Benedict of Nursia was living and being educated in Rome. He soon fled the worldliness that he saw there to seek solitude.
You can hear how ancient this is! Very, very like the eastern Christian chants, and much like other chants from that region as well. Memorizing. Modern music just doesn't compare to this.
Here are the lyrics and translation.
Tecum principium in die virtutis tuae in splendoribus sanctorum: ex utero ante leciferum genui te.
You shall have sovereignty in the day of your power
in the beauties of holiness:
you are my son, born before the morning star.