Listen to Mass IX, "Cum iubilo": IV. Agnus Dei online. Mass IX, "Cum iubilo": IV. Agnus Dei is an English language song and is sung by Mary Berry and Schola Gregoriana of Cambridge. Mass IX, "Cum iubilo": IV. Agnus Dei, from the album Gregorian Chant: Mass of the Annunciation (A Celebration of High Mass According to the Traditional Roman Rite), was released in the year 1997. The duration of the song is 1:45. Download English songs online from JioSaavn.