This piece is one of 60 Schlag-Arien (Airs for keyboard
sometimes viewed as an percussion instrument). The last
10 of these Arias (no. 51-60) are intended to christmas
time and called Pastorellas by the composer (worunter
die letzten X. Pastorellen vor die Weynacht-Zeit
...
The titles of individual Pastorellas were added later
by editors.