I heard this one decades ago, but maybe you haven’t:
Warning! Muso joke: What’s the difference between a rock guitarist and a jazz guitarist?
A rock guitarist plays three chords to thousands of people, while the jazz guitarist plays thousands of chords to three people
(Via the music of sound)
How do guitar players change a lightbulb? One climbs on the ladder and changes the bulb and 99 other guitarists proclaim: “I could have done that!!”