This optional piano accompaniment adds an additional depth to the duets, or takes the place of the second part for the duet.  The nineteen pieces are:  Angels We Have Heard On High; Away In A Manger; God Rest Ye Merry, Gentlemen; Bring A Torch, Jeanette, Isabella; Deck The Halls; The First Noel; Good King Wenceslas; Jolly Old Saint Nicholas; It Came Upon The Midnight Clear; What Child Is This?; O Little Town Of Bethlehem; Hark! The Herald Angels Sing; O Tannenbaum (O Christmas Tree); O come, All Ye Faithful (Adeste Fideles); Up On The Housetop; We Three Kings; Silent Night, We Wish You A Merry Christmas and Jingle Bells.