Even though this Musette is in J. S. Bach's notebook, music historians do not know who composed this piece - it is considered to be anonymous. 

Listen to how the performer - Rosalyn Tureck - plays this piece mixing-up jumpy and connected sounds.  The different ways we can change the continuity of a group of notes (such as playing them jumpy or connected, for example) is called articulation. Using different articulations in the same piece is an important rule of the Baroque period.