Helpful first violinist?

• Helpful to first violinist for example
• Band member
• One who plays without vocals
• Fan must start in line to see player
• Tuba player, e.g
• One just plays at work
• Someone who plays a musical instrument (as a profession)

Wiktionary Word definitions in Wiktionary
n. One who plays a musical instrument, as distinguished from a vocalist

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Instrumentalist \In`stru*men"tal*ist\, n. One who plays upon an instrument of music, as distinguished from a vocalist .

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