Someone who plays a musical instrument (as a profession)

• Fan must start in line to see player
• Case: it involves singular person on the fiddle?
• Tuba player, e.g.
• One just plays at work
• Tuba player, e.g
• One who plays without vocals
• Band member
• Ancillary role of 2 Down

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1823, from instrumental in the musical sense + -ist .

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Instrumentalism \In`stru*men"tal*ism\, n. (Philos.) The view that the sanction of truth is its utility, or that truth is genuine only in so far as it is a valuable instrument. -- In`stru*men"tal*ist , n. Instrumentalism views truth as simply the value belonging ...