Listen to Offertorium: laetentur caelj online. Offertorium: laetentur caelj is an English language song and is sung by The Benedictine Monks. Offertorium: laetentur caelj, from the album Gregorian Chants: Peaceful Night, was released in the year 2017. The duration of the song is 5:01. Download English songs online from JioSaavn.