1) Accompanist 2) Accompanyist 3) Accordionist 4) Bagpiper 5) Bandsman 6) Bassist 7) Bassoonist 8) Carillonneur 9) Cellist 10) Clarinetist 11) Clarinettist 12) Cornetist 13) Fiddler 14) Flautist 15) Flutist 16) Guitarist 17) Harmoniser 18) Harmonizer 19) Harper 20) Harpist 21) Harpsichordist 22) Hornist 
• (n.) One who plays upon an instrument of music, as distinguished from a vocalist.
In`stru·men'tal·ist noun One who plays upon an instrument of music, as distinguished from a vocalist . 
noun someone who plays a musical instrument (as a profession)
a person who plays a musical instrument. · an advocate of instrumentalism.