noun
cornet
A brass instrument similar to a trumpet but with a more conical bore and mellower tone. Used in brass bands and jazz.
from Italian cornetto
彼はジャズバンドでコルネットを吹いている。
He plays the cornet in a jazz band.
トランペット is the more common trumpet with a cylindrical bore and brighter sound, while コルネット is mellower and often used in brass bands.
Borrowed from Italian 'cornetto', a diminutive of 'corno' (horn).