Listen to Requiem, Op. 48: I. Introit. Kyrie online. Requiem, Op. 48: I. Introit. Kyrie is an English language song and is sung by Carlo Maria Giulini, Philharmonia Orchestra, Philharmonia Chorus, Gerard Souzay and Janet Baker. Requiem, Op. 48: I. Introit. Kyrie, from the album Classical Music for Christmas, was released in the year 2013. The duration of the song is 7:27. Download English songs online from JioSaavn.