Listen to Advent Antiphons: O Rex gentium online. Advent Antiphons: O Rex gentium is an English language song and is sung by Paul Silverthorne and Simone Rebello. Advent Antiphons: O Rex gentium, from the album Man I Sing, was released in the year 2007. The duration of the song is 1:19. Download English songs online from JioSaavn.