Helpful to first violinist for example

• Band member
• Musician
• One who plays without vocals
• Tuba player, e.g
• Someone who plays a musical instrument (as a profession)
• Tuba player, e.g.
• One just plays at work
• Case: it involves singular person on the fiddle?

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 ...