An tenor version of the “lightbulb joke” is:
 
Q: How many tenors does it take to screw in a light bulb?
A: None. They can’t reach that high.
 
“How many tenors does it take to screw in a light bulb?  Three - One to do it and two to stand there and tell each other how they could have done it better” was cited in print in 1992. “How many tenors does it take to change a lightbulb? Six.  One to do it, and five to say, ‘It’s too high for HIM’” was cited in 1994.
 
Related jokes include “How many altos does it take to screw in a light bulb?” and “How many sopranos does it take to screw in a light bulb?”
 
   
Wikipedia: Tenor
Tenor is a type of classical male singing voice whose vocal range is between the countertenor and baritone voice types. The tenor’s vocal range (in choral music) lies between C3, the C one octave below middle C, and A4, the A above middle C. In solo work, this range extends up to C5, or “tenor high C”. The low extreme for tenors is roughly A♭2 (two A♭s below middle C). At the highest extreme, some tenors can sing up to two Fs above middle C (F5). The tenor voice type is generally divided into the leggero tenor, lyric tenor, spinto tenor, dramatic tenor, heldentenor, and tenor buffo or spieltenor.
       
Google Groups: bit.listserv.hellas
light bulb jokes
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5/13/92
From:      VAX1::SSR48327   “SSR48327” 12-MAY-1992 16:16:00.68
To:      RPN18795
CC:
Subj:      lite is it!
Canonical Collection of Light Bulb Jokes
(...)
How many tenors does it take to screw in a light bulb?  Three - One to do it and two to stand there and tell each other how they could have done it better.
 
Google Groups: soc.motss
Another inane lightbulb joke            
Michael Bryan
3/10/93
(...)
Q:  How many tenors does it take to change a lightbulb?
A:  What’s a lightbulb?
 
Google Groups: rec.humor
Tenor jokes
Harry Katz
7/22/93
(...)
2.  How many tenors does it take to change a light bulb?
Only one to hold the bulb while the rest of the world turns around him.
 
Google Groups: rec.humor
Canonical List Of Music Humor 2/3
Reality Terabytes
8/26/94
(...)
How many tenors does it take to change a lightbulb?
Six.  One to do it, and five to say, “It’s too high for HIM.”
   
Google Groups: rec.music.classical.performing
Know Any Singer Jokes?
Peggy Fieland
3/14/95
(...)
Q:  How many tenors does it take to change a lightbulb?
A:  What’s a lightbulb?
 
Google Books
The Musician’s Joke Book:
Knowing the Score
By Nancy Groce
New York, NY: Schirmer Books
1996
Pg. ?:
How many tenors does it take to screw in a light bulb?
Just one; he simply hold it up and the world revolves around him.
 
Google Books
July 1996, Opera News (New York, NY), pg. 58:
How many tenors does it take to screw in a lightbulb?
By F. Paul Driscoll
 
26 October 1996, Chicago (IL) Tribune, “Channel surfing” by Steve Johnson, sec. 1, pg. 28, col. 1:
“Carreras, Domingo, Pavarotti with Levine: The Three Tenors in Concert 1996”: How many tenors does it take to change a light bulb? Three—Carreras to hold the ladder, Domingo to change the bulb and Pavarotti to cancel due to a, er, strained neck
 
Twitter
Sarah O’Keefe‏
@sarahokeefe
@sbate bad music joke…How many tenors does it take…? http://tinyurl.com/6lufd6
7:44 AM - 25 Nov 2008
 
Twitter
Christian Friday‏
@Its_CFriday
How many tenors does it take to change a lightbulb? One to do it. 5 to complain that its too high
7:25 PM - 23 Jan 2010
 
Twitter
...Because we care!!‏
@LasVegascarlsjr
How many tenors does it take to change a light bulb?
Six. One to change it and five to say “It’s too high for him.”
12:43 AM - 1 Feb 2010
 
Twitter
Rhys Meirion‏
@RhysMeirion
Red Nose Day, So - How many Tenors does it take to change a light bulb, 2, 1 to change it and 1 to remark “I bet you can’t reach that high!”
5:12 AM - 18 Mar 2011
 
Twitter
Matthew McDaniel‏
@Falsettone
How many tenors does it take to screw in a light bulb? Trick question. Tenors only think they can reach that high.
7:56 PM - 17 May 2013
 
Twitter
Groovebulb‏
@Groovebulb
Light humour: How many tenors does it take to change a light bulb? None. They can’t get up that high!
2:18 AM - 18 Apr 2013
 
Twitter
Shit Jokes‏
@ShitJokes
How many tenors does it take to screw in a light bulb?
None, they can’t reach that high.
#NewTenPoundNote
3:19 AM - 14 Sep 2017