All old classics.
Here is yet another (also applied to big bands with a singer, R&B, etc.):
Q: What’s the difference between a bull and a symphony orchestra?
A: The bull has the horns in front and the ass in the back.
Q: What do you get when you play New Age music backwards?
A: New Age music.
Q: How many Deadheads does it take to change a lightbulb?
A: 12,001. One to change it, 2,000 to record the event and take pictures of it, and 10,000 to follow it around until it burns out.
Q: What’s the definition of a gentleman?
A: Someone who knows how to play the oboe but doesn’t.