What's a trumpet player's most effective form of birth control?
His personality.

But just so the trumpet players don't think I'm picking on them, here are a couple of other musician jokes I have come to love over the years.

What did the drummer get on his IQ test?
Drool.

How do you get two flute players to play in tune?
Shoot one.

How do you get a guitarist to stop playing?
Give him sheet music.

What do you call a musician who breaks up with his girlfriend?
Homeless.

How do you get a musician off your front porch?
Pay for the pizza.

A boy says to his father, "Dad, I want to grow up and be a musician!" The father replies, "I'm sorry, son, but you can't have it both ways."