Listen to God Rest You Merry, Gentleman / O Christmas Tree / Deck the Halls online. God Rest You Merry, Gentleman / O Christmas Tree / Deck the Halls is an English language song and is sung by John Klein. God Rest You Merry, Gentleman / O Christmas Tree / Deck the Halls, from the album Let's Ring the Bells All Around the Christmas Tree, was released in the year 2014. The duration of the song is 2:48. Download English songs online from JioSaavn.