Gregorian Chant: O magnum mysterium - Responsorium (III) from Proprium de Tempore. In Nativitate Domini. Ad Matutinum.

Gregorian Chant: Hymns and Vespers for the Feast of the Nativity,3 mins, 7 secs

• Gregorian Chant: O magnum mysterium - Responsorium (III) from Proprium de Tempore. In Nativitate Domini. Ad Matutinum.