Mein Gott, wie lang, ach lange in D minor, BWV 155 "My God, how long, ah! How long?"

On 2 March 1714 Bach was appointed concertmaster of the Weimar court capelle of the co-reigning dukes Wilhelm Ernst and Ernst August of Saxe-Weimar. As concertmaster, he assumed the principal responsibility for composing new works, specifically cantatas for the Schlosskirche (palace church or ducal chapel), on a monthly schedule. He wrote this cantata for the second Sunday after Epiphany.