The Haydn and Hummel Concertos were composed for a brand new instrument invented by Anton Weidinger – who was a member of the court orchestra in Vienna – a trumpet with keys which increased both the range and flexibility of the instrument. The remaining two works are by Bohemian composers, the concerto by Neruda dating from a slightly earlier period, and the Variations of B. D. Weber the earliest work in this form composed for the valve trumpet.