Piano concertos by Wolfgang Amadeus Mozart followed by the works by Charles Rosen, and Daniel N. Leeson and Robert Levin. The first complete edition in print was not until that of Richault from around 1850; since then the scores and autographs have become widely available. Concerto No. 7 is for three (or two) pianos and orchestra, and No. 10 is for two pianos and orchestra, leaving 21 original concertos for one piano and orchestra. Early keyboard concertos were written by, among others, C.P.E. Bach, J.C. Bach, Soler, Wagenseil, Schobert, Vanhall and Haydn. Earlier still, in the Fifth Brandenburg Concerto by J.S. Bach, the keyboard part is
Hansa-Brandenburg B.I Hansa-Brandenburg B.I The Hansa-Brandenburg B.I was an unarmed military trainer and reconnaissance biplane of World War I, flown by the Austro-Hungarian Air Service. Early models were known internally to the Hansa-Brandenburg firm as the type D, while later models with a more powerful engine were designated FD. This aircraft was one of the earliest designs of Ernst Heinkel, who was working for Hansa-Brandenburg at the time. It was an entirely conventional two-bay biplane with staggered wings of unequal span. The pilot and observer sat in tandem in a long open cockpit. The aircraft was produced under license by Aero, both