Keyboard concertos by Johann Sebastian Bach 1059) which adds an oboe to the strings and continuo. Most of Bach's harpsichord concertos (with the exception of the 5th "Brandenburg Concerto") are thought to be arrangements made from earlier concertos for melodic instruments probably written in Köthen. In many cases, only the harpsichord version has survived. They are among the first concertos for keyboard instrument ever written. The earliest extant sources regarding Bach's involvement with the keyboard concerto genre are his Weimar concerto transcriptions, BWV 592–596 and 972–987 (), and his fifth "Brandenburg Concerto", BWV 1050, the early version of which, BWV 1050a, may have originated before Bach
Brandenburg end, and from 1323 up until 1415 Brandenburg was under the control of the Wittelsbachs of Bavaria, followed by the Luxembourg Dynasties. Under the Luxembourgs, the Margrave of Brandenburg gained the status of a prince-elector of the Holy Roman Empire. In the period 1373-1415, Brandenburg was a part of the Lands of the Bohemian Crown. In 1415, the Electorate of Brandenburg was granted by Emperor Sigismund to the House of Hohenzollern, which would rule until the end of World War I. The Hohenzollerns established their capital in Berlin, by then the economic center of Brandenburg. Brandenburg converted to Protestantism in