This miniscule piece, which can be played in less than two minutes even at a cautious tempo, is ascribed to "Bernhardt Bach." That could mean any of three of J.S. Bach's relatives, including his third, short-lived son Johann Gottfried Bernhard Bach. This Fantasia could count as a two-part invention, with the right-hand theme tiptoeing over a restless bass part that ranges fairly widely, the two lines soon trading question-and-answer phrases and sometimes switching hands before reverting to their original subject-accompaniment roles at the very end.

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