The series "Tomorrow Santa Claus Comes" was designed for making music together during the Christmas season. The focus is on duo playing with two identical instruments: two violins, two violas, two cellos, two soprano recorders, and two flutes. Since the upper voice (melody) is accompanied by lyrics, there is also the possibility of performing with singing and a supporting voice. The pieces are kept simple, allowing even musicians with little practice to participate. The series includes two piano editions that can be combined with all instrumental booklets: In addition to the well-known very easy edition for beginner pianists, featuring predominantly two-part pieces in a five-tone range, there is now for the first time a slightly richer, two- to three-part edition for somewhat more advanced players.