The Blue Set carols are the most musically challenging. Each carol has a statement of the melody and then a variation. The carols are suitable for recitals or special music in church.
Included in the set are O Little Town of Bethlehem, Away in a Manger, While Shepherds Watch Their Flocks by Night, Hark! the Herald Angels Sing and Joy to the World.
The sheet music is available for purchase here.