Capriccio on the departure of a beloved brother

The Capriccio on the departure of a beloved brother (Italian: Capriccio sopra la lontananza del suo fratello dilettissimo), BWV 992, is an early work by Johann Sebastian Bach, possibly modeled on the Biblical Sonatas of Johann Kuhnau. The story that Bach performed it at age nineteen when his brother Johann Jacob left to become an oboist in the army of Charles XII in Sweden is questionable. But the chosen tonality of B-flat major seems to be a deliberate reference to the family's name ("B" in German is B-flat in English).