Ok, I had to share this with my number one music site, I just found this site filled to the brim with tasteless, yet still entertaining jokes about musicians, musical instruments, and conductors.
Here's an example:
Why is a viola different from an onion?
No-one cries when you cut a viola in half.
 
What do you have when a group of conductors are up to their neck in wet concrete?
Not enough concrete.

http://www.mit.edu/~jcb/jokes/

Yes they are sad... and they're pretty much all like that.
They're just too precious not to share.

There's a drummer who was fed up of people making joke about him who decided to start to play the guitar
He went to a shop to buy one and ask the shop keeper
" I'd like to buy a guitar "
the guy answers
" you, you're a drummer!!!"

" How do you know that?

" It's a fish shop here!!!"

how do you fix a broken tuba?

A Tube - a - Glue

LOL Awesome guys !

how do you know when a Singer is knocking at your door?................................................................................
they never know when to come in......................

Musicians are a joke!!!  

What do you call the guy who hangs around with a buch of musicians?

A Drummer.