I subscribe to a magazine called The Fretboard Journal. Great pictures, in-depth articles, a quarterly that is pretty much the top of the line for looks and content. Current issue has a piece where one well-known and young musician interviews another well-known and older one, and in it is a musical joke I hadn't heard before.
If you are a guitar player, you will probably think it's funny:
Q: How do you stop a classical musician from playing?
A: You take away his sheet music.
Q: How do you stop a guitarist from playing?
A: You put sheet music in front of him ...
(While I don't explain jokes, generally, and this one isn't really what you'd call too smart for the room, it does require that you know a bit about how things work in the musical world. Most guitarists outside the classical and jazz realms don't read music. Most rock and blues players can't. I can't sight-read, though given enough time, I can go through and with much labor figure out standard notation. I'd rather not. If I wanted to be a session player or work in an orchestra, I'd have to learn, since I'm not going there, life is too short.
Not being able to read music is not necessarily a problem -- it depends.
None of the Beatles could. They did all right.
Ray Charles, on the other hand, could read, even though he was blind.)