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What were Johann Sebastian Bach’s responsibilities after becoming concertmaster at Weimar in 1714?

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Painting by Elias Gottlieb Hausmann of Johann Sebastian Bach wearing a dark coat with a white shirt and holding a sheet of music in his left hand. — Johann Sebastian Bach Johann Sebastian Bach.

When Johann Sebastian Bach was appointed concertmaster at Weimar on March 2, 1714, his primary responsibility was to compose a cantata every month.1

In addition to this specific duty, Bach continued his involvement in the musical life of the court, which included teaching the duke’s nephews, Ernst August and Johann Ernst. He also participated in musical activities at the Gelbes Schloss ("Yellow Castle"), which was occupied by the duke's nephews at that time.1