Riding back a late night on an MTA bus, I spotted a man rolling around an upright bass. I started up a conversation with him about how he was a jazz musician for various bands and playing different clubs every night. I mentioned how i'm always much more impressed by the backing band than the "star" of the show each time I see a jazz show. This prompted him to tell me this joke:
Whats the difference between a bull and a band?
On a bull, the horns are in the front and the ass is in the back.