Brandenburg-Schwedt his dominions and furnishing his castle in a Baroque style at great expense. His younger brother Albert Frederick (1672–1731) became a general lieutenant and Grand Master of the Order of Saint John; the third-born, Charles Philip (1673–1695) likewise became an officer and shortly before his death secretly married the Piemontese noblewoman Caterina di Balbiano, who called herself "Madame de Brandebourg" as a widow. The youngest of Dorothea's sons was Margrave Christian Ludwig (1677–1734), officer and administrator of Halberstadt, the honoree of Bach's "Brandenburg Concertos". The brisk building activity was continued by Philipp William's son and successor, Margrave Frederick William (1700-1771).
Horn Concertos (Mozart) Horn Concertos (Mozart) The Horn Concertos by Wolfgang Amadeus Mozart were written for his friend Joseph Leutgeb whom he had known since childhood. Leutgeb was a skilled player, as the works are very difficult to perform on the natural horn of the period, requiring lip trills, much hand-stopping, and rapid tonguing. In addition to the four works listed above, there are two incomplete concerto movements, K. 370b and the Concert Rondo, K. 371, both from 1781 and both in E-flat major, and a 91-bar fragment of the first movement for a concerto in E major (K. 494a), written in 1785