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

Gregorian Chant,3 mins, 5 secs

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