Michael Haydn arrived in Salzburg just prior to composing the concerto.

[3] The music is derived from Haydn's Violin Concerto in G Major (MH 52).

"[6] Besides the solo trumpet in C, the concerto is scored for 2 flutes, strings, and continuo.

Part of the difficulty of the concerto is because of the very high notes for the trumpet, which is written even higher than the flutes (indeed, the solo trumpet part is much higher than would be advisable for the modern trumpet, while the flute parts are too low for modern flutes to be heard clearly against a full string section).

Tarr's cadenza for the second movement even goes up to a G above high C but provides ossia for the next lower G.