An orchestra riddle is:
 
Q: If lightning strikes an orchestra, who is most likely to get hit?
A: The conductor.
 
The joke has been cited in print since at least 1996.
 
“My uncle was a great conductor. He was struck by lightning” is another version of the joke.
 
     
Google Books
The Little Giant Book of Riddles
By Joseph Rosenbloom
New York, NY: Sterling Publishing Company, Inc.
1996
Pg. 82:
If lightning strikes an orchestra, who is most likely to get hit?
The conductor.
   
Google Books
Side-Splitting Riddles
Illustrated by Kevin Rechin
Columbus, OH; Highlights for Children, Inc.
2012
Pg. ?:
If lightning strikes an orchestra, who is most likely to get hit?
The conductor.
 
Twitter
charlotte williams
@CharlotteSerina
If lightning strikes an orchestra, who is most likely to get hit?
The conductor! Xxx
5:35 AM - 14 Jan 2012
         
Twitter
Jim Cota
@jimcota
If lightning strikes an orchestra, who does it hit?
The conductor! #KidsJokes #fb #in
8:54 PM - 12 Feb 2012 from Indianapolis, IN
 
Twitter
Dr. Dave Stukus
@AllergyKidsDoc
Really Bad Joke of the Week: Who is the first person to get hit if lightning strikes an orchestra?
The conductor.
4:01 PM - 15 Dec 2017
 
Reddit—Jokes
If lightning strikes an orchestra, who is most likely to get hit?
submitted September 10, 2018 by geminirich
The conductor.