I have never heard "John Booth violin" used, either as an idiom or another term. You should make certain that you heard the other person clearly.
a violin
John Wilkes Booth
John Wilkes Booth killed Lincoln in the Ford Theatre.
John Wilkes Booth was an actor.
John wilks booth
how did john wilkes booth act
an actor.how did john wilkes booth actJohn Wilkes Booth was an actor
John Wiljebooth
John Wilkes Booth had at least one sister. Her name was Asia.
John Wilkes Booth John Wilkes Booth
John Booth was born on February 1, 1984.
Why yes John Wilkes booth is mean