Listen to Gregorian and Ambrosian Music for the Feast of the Three Magi: Symbolum, "Credimus in unum Deum" (Ambrosian) online. Gregorian and Ambrosian Music for the Feast of the Three Magi: Symbolum, "Credimus in unum Deum" (Ambrosian) is an English language song and is sung by Schola Cantorum Coloniensis/Dr. Gabriel Maria Steinschulte. Gregorian and Ambrosian Music for the Feast of the Three Magi: Symbolum, "Credimus in unum Deum" (Ambrosian), from the album Zen Chants, was released in the year 2011. The duration of the song is 3:29. Download English songs online from JioSaavn.