A session musician; although The Beatles occasionally tried playing violins - who could resist trying out session musicians instruments - none of their efforts made it onto records.
Violinist
A person who plays the violin is called a violinist or a fiddler.
lute player
It is called a solo. The texture is called 'monophonic' texture (it means "with no accompaniment").
a "Synth Player" or "Synthesizer Player"
Call them anything you like, they won't answer back!
Violinist
A person who plays the violin is called a violinist or a fiddler.
A guitarist.
A bassist
An organist
a harmonist.
a guitarist
an "accordionist"
lute player
lute player
It is known as oscillation of a violin string.