A Musician.
or a percussionist if they like, play percussion instruments
A keyboardist, a person who plays Piano is a Pianist.
A music teacher.
A bassist
A guitarist.
a guitarist
An organist
a harmonist.
an "accordionist"
lute player
lute player
Call them anything you like, they won't answer back!
Someone who plays a cornet is commonly referred to as a "cornetist." This term is used to describe musicians who specialize in playing this brass instrument, which is similar to a trumpet but has a more conical shape and a warmer tone. Cornetists can be found in various musical settings, including brass bands, orchestras, and solo performances.