Bach used the materials for this sonata several times throughout his life. Each collection of parts is different, and there are three versions. This is version 1019c, as labeled by the BWV categorical system for Bach's works. There are five parts of this last of his six sonatas for violin and harpsichord. We discover the joys of rhythmic ambiguity, rhythmic complexity, and even a middle movement without the violin! (And yet sometimes this is called "Violin Sonata in G major," shirking the credit of the keyboardist.) 

Christian focuses in on the end of the 4th movement, where a short ending extends and wanders into a surprising and somewhat tonally unclear ending. But it is made clear in the next moment, when the joyful key of G major returns in the jaunty final allegro.

Sonata for Violin and Harpsichord in G major (BWV 1019c) as performed by Shunske Sato and Diego Ares for the Netherlands Bach Society