Listen to Gregorian Chant: Christus natus est nobis (mode 4) online. Gregorian Chant: Christus natus est nobis (mode 4) is an English language song and is sung by Benedictine Nuns Choir of l'Abbaye de Notre-Dame d'Argentan. Gregorian Chant: Christus natus est nobis (mode 4), from the album Sacred Chants, was released in the year 2017. The duration of the song is 2:57. Download English songs online from JioSaavn.