B minor, 9/16 time signature.

This piece is characterized by a free, capriccio-like style of writing. Similar to the Inventions, but particularly in the Sinfonias, where many pieces are strict and fugal in nature, it is surprising that a piece with a light character concludes the collection. If this surprise is interpreted as a form of humor, then this piece is indeed fitting for a capriccio.

The piece largely consists of two main parts. The first part (from m. 1) and the second part (from m. 14) are followed by a coda (from m. 35), with interludes inserted between each section. Before the coda, a pause indicated by a fermata is placed in m. 32, hinting at the possibility of a cadenza. At the very end of the piece, "Finis" is written, clearly stating that with this, the series of "proper instruction" that began with the Inventions has concluded.