A "harmonicanist" is what a person who plays the harmonica is called.
Guitarist
A bass Guitarist I would venture to guess that a person who plays the bass guitar is called a "bassist". Calling a person who plays a bass guitar a "guitarist" would also be acceptable. Bass player Bassist Bass guitarist Guitarist is misleading
A guitarist.
a guitarist
a guitarist
A person who plays the guitar.
A bassman is a person who plays the bass guitar.
Call them anything you like, they won't answer back!
You would call a person who plays the French horn a "hornist."
An axman is a person who uses an axe, or, informally, a person who plays the guitar or saxophone.
A person who plays in movies is a actor or an actress