Listen to William Byrd; William Mathias: Magnificat online. William Byrd; William Mathias: Magnificat is an English language song and is sung by The Choir of Jesus College Cambridge, Christopher Argent and David Swinson. William Byrd; William Mathias: Magnificat, from the album The Rise of English Music, was released in the year 2017. The duration of the song is 4:04. Download English songs online from JioSaavn.