Get into the Christmas spirit with our O Christmas Tree! piano sheet music. O Christmas Tree! is a German Christmas song which became popular in the early 20th century and is thought to be based on 16th century traditional folk song extolling the evergreen virtues of the fir tree (tannenbaum) as a symbol of constancy and faitfulness. Choose according to your skill level from our different adaptations for piano solo or accompanying piano Level 2 ranging from beginner to accomplished, with or without reading aids. This well-known melody has been covered by artists all over the world, including Aretha Franklin, Chicago, James Taylor, Johnny Mathis and the cast of Glee.