Listen to Requiem: Agnus Dei online. Requiem: Agnus Dei is an English language song and is sung by Giuseppe Di Stefano, Cesare Siepi, Herva Nelli and Fedora Barbieri. Requiem: Agnus Dei, from the album Classical Moods Vol. 3, was released in the year 2013. The duration of the song is 4:30. Download English songs online from JioSaavn.