Charge

Keyed Bugle or Keyed Clarino (left) and a modern trumpet (right)

I was just listening to a concerto for trumpet by a composer named Johann Nepomuk Hummel. He and Haydn wrote concertos at about the same time (1990s) for a new instrument or pretty new instrument called the keyed bugle or keyed clarino (a small trumpet with keys instead of either none or valves -3).

You know bugles from someone blowing revelry or taps in the army. In the last part of the 18th century, a fellow named Anton Weidinger became very proficient on a bugle with keys on it. If you think about bugles and such, they don't play a lot of different notes - just the "harmonic series"; far more to it than I want to get into here and it would further bore you to death.  With the "keys", the bugle could play all the notes in the chromatic scale  -  think all the white and black keys on the piano instead of just some of the white keys.

Awkward as it was and perhaps weird sounding that it had to be, it spawned two of the best concertos for trumpet. 

See.  You learned something.