June 26th 1730 was the 2nd day of the three-day celebrations of the 200th anniversary of the Augsburg Confession, the primary confession of faith of the Lutheran Church and one of the most important documents of the Lutheran Reformation. The Augsburg Confession was written in both German and Latin and was presented by a number of German rulers and free-cities at the Diet of Augsburg on 25 June 1530 to Emperor Charles V.
Bach wrote no less than three cantatas for this celebration, but unfortunately all are lost. Luckily two of them where based on other cantatas that did survive. Gott, man lobet dich in der Stille, BWV 120b, lives on in the reworked BWV 120, which Bach wrote for the 1742 Ratwechsel (August 29th). Singet dem Herrn ein neues Lied, BWV 190a, is based on BWV 190, which he wrote for New Year''s Day 1724. The last Cantata, Wünschet Jerusalem Glück, BWV Anh. 4a is unfortunately completely lost.