a cymbalist
A "harmonicanist" is what a person who plays the harmonica is called.
A person who plays Scrabble is called a Scrabbler. (unofficially)
a cymbalist
A drummer or percussionist plays the drums.
accordionist
Guitarist
harpist
guitarist
A saxophonist.
a baritonist
A pianist.
The umpire is the person that rules on plays.