Over the years, I've heard a ton of funny jokes that center around musicians and the music business. I could put up about 20 here,but I'll let you guys do it. Let's keep this CLEAN! Also, no slamming of particular people, like saying, "so and so is a joke." It's already been done. Ok, here's the starter joke: What's the definition of an optimist? A banjo player with a pager (cell phone for th…