While he took the opportunity to revise the music, most likely, it omposed over a number of years while Kapellmeister at Köthen, and possibly extending back to his employment at Weimar (1708--17).
While he took the opportunity to revise the music, most likely, it was not freshly composed. He appears to have selected the six pieces from concertos he had composed over a number of years while Kapellmeister at Köthen, and possibly extending back to his employment at Weimar (1708--17).