Listen to Advent Antiphons: O Clavis David online. Advent Antiphons: O Clavis David is an English language song and is sung by Paul Silverthorne and Simone Rebello. Advent Antiphons: O Clavis David, from the album Man I Sing, was released in the year 2007. The duration of the song is 2:01. Download English songs online from JioSaavn.