Classical musicians tell Viola player jokes instead of drummers.
There's an orchestra rehearsal when the conductor gets a phone call. He apologises to the orchestra but says he has to take the call. Can they all take 5. Then the 1st viola player pipes up and says " I do do amature conducting I can take over for a little while? " The condutor agrees and goes off to take his call. When he comes back the viola player resumes his seat and the 2nd viola says " Where did you get to? "

There is a whole raft of them like...
What do you cal a drummer without a girlfriend? .. homeless
How do you know a drummers knocking on your door?.... it speeds up.
Whats the difference between a drummer and a drum machine? .... A drum machine doesnt load up the van
So this drummer is tied of all the jokes so he goes to a music shop and asks for something else to learn to play. The shop owner says " Look around and I will be back soon when you have decided what you want. "
The drummer says " I will take the red trumpet and that accordion " Shop keeper says " I can sell you the fire extinguisher but the radiator stays where it is "

As a former... Ehem... Percussionist, I have to say that these vicious stereotypes are, well, sort of spot on. I have to go and wipe my chin.

Another ... How does a band check that the stage is level ?
The drummer drools from both sides of his mouth .