Page14 #9, Larghetto

Selected Duets for Trumpet, Page 14 Number 9, Larghetto, performed by David Summer.
Wolfgang Amadeus Mozart is not a name you often see associated with the trumpet. Mozart's works for wind instruments concentrated on the flute and clarinet. This duet was likely originally a duet for one of those instruments. Of course Mozart, firmly in the classical period, is probably most famous for his operas.
Larghetto, the de facto title of this duet, is a tempo marking meaning a bit faster than Largo. It's often a challenge for a student to maintain a steady, slow tempo. I've found that generally students will have a tendency to start to speed up, particularly when reaching the second half of the duet, where the second trumpet's rhythm is much different from that of the first trumpet.
The metronome setting for this performance is quarter note = 76.