Keyboard concertos by Johann Sebastian Bach soloists, were all adapted into harpsichord concertos by the composer, BWV 1058, 1054 and 1062 respectively. It is often assumed that Bach's extant violin concertos were written in his Köthen period (1717–1723): it can however not be proven from documentary evidence that any of them existed prior to around 1730. In September 1725 Bach performed organ music, accompanied by other instruments, in Dresden. The works he performed there have not been identified. More than a year later he composed several cantatas with an organ obligato part. Several movements of such cantatas were derived from earlier lost concertos, and resurfaced in
Jim Brandenburg His work has been included in many other magazines, such as "Life", "Newsweek", "The Smithsonian", and "GEO" and has been featured on all the major television and radio networks including ABC's Prime Time Live and CBS News Sunday Morning and Dateline NBC as well as National Public Radio's All Things Considered. Brandenburg was commissioned by the United States Postal Service to create a set of wildlife stamps. They were released on May 14, 1981. In 1980, Brandenburg learned of a population of wolves on Ellesmere Island who had not yet had the fear of man instilled into them. Brandenburg therefore