Haydn composed his famous concerto especially for trumpet for his friend Anton Weidinger (1766-1852), a virtouoso performer who developed a special keyed trumpet which allowed a full chromatic scale. Weidinger's invention, while somewhat successful, was ultimately superceded by the valve system used now in the 1830s. Haydn's concerto was first performed on March 28, 1800 in Vienna, with Weidinger as soloist - not long after his appointment as Imperial Royal Court and Theatre trumpeter. The new study score offered here is a reduced-size format of the newly engraved and well-reserached large score prepared in 2010 by Clark McAlister.