What's the difference between a drummer and a drum machine? You only have to punch the information into the drum machine once.
Drummer jokes are almost endless. I once came across a webpage filled to the brim with drummer jokes. I read them all, and most of them were worth a giggle. Then I found out that was just page one of about a dozen or so. A lot of drummer jokes are in-jokes though. A good/bad example is: What do Ginger Baker and Trifle have in common? They both suck without Cream.