Listen to Mathias: Salvator Mundi, Op.89 - 3. Be We Merry In This Feast online. Mathias: Salvator Mundi, Op.89 - 3. Be We Merry In This Feast is an English language song and is sung by Gondwana Voices, Lyn Williams and Sydney Children's Choir. Mathias: Salvator Mundi, Op.89 - 3. Be We Merry In This Feast, from the album Voices Of Angels - Joyful Music For Christmas, was released in the year 2016. The duration of the song is 1:58. Download English songs online from JioSaavn.