OK, you asked for it.
1. What do call a drummer without a girlfriend ? Homeless
2. How do you know when the drum riser is level? The drummer dribbles out of both sides of his mouth
3. What is the difference between a drummer and a drum machine ? With a drum machine you only have to punch the information into it once
There are many more, there is a limit to how much bad taste I can dispense in one go.