Trumpet Concerto (Haydn)
Original instrument 
Anton Weidinger developed a keyed trumpet which could play chromatically throughout its entire range. Before this, the trumpet was valveless and could only play a limited range of harmonic notes by altering the vibration of the lips. Most of these harmonic notes were clustered in the higher registers, so previous trumpet concertos could only play scalar melodies at very high pitches (e.g., Bach's Brandenburg Concerto No. 2). Haydn's concerto includes melodies in the lower register, exploiting the capabilities of the new instrument.
There were attempts all over Europe around the mid-classical era to expand the range of the trumpet using valves, but Weidinger's idea of drilling holes and covering them with flute-like keys was not a success as it had poorer sound quality. Thus the natural trumpet still had continual use in the classical orchestra whilst the keyed trumpet had barely any repertoire. The valved trumpets used today started to appear in the 1830s.
The work is composed in three movements (typical of a concerto), and they are marked as follows:
- I. Allegro (sonata)
- II. Andante (sonata)
- III. Finale-Allegro (rondo)
In addition to the solo trumpet, the concerto is scored for an orchestra consisting of 2 flutes, 2 oboes, 2 bassoons, 2 horns, 2 (presumably natural) trumpets (which generally play in support of the horns or timpani rather than the solo trumpet), timpani and strings.
See also 
- Michael Haydn also wrote a trumpet concerto, with the same two-movement form as Leopold Mozart's Trumpet Concerto.
- Johann Nepomuk Hummel also wrote a trumpet concerto for Anton Weidinger.
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