Listen to Requiem, Op. 48: Agnus Dei online. Requiem, Op. 48: Agnus Dei is an English language song and is sung by Philharmonia Chorus, Carlo Maria Giulini and Philharmonia Orchestra. Requiem, Op. 48: Agnus Dei, from the album The Best of Classical Music - 50 Best Tracks (Remastered), was released in the year 2012. The duration of the song is 6:07. Download English songs online from JioSaavn.