How about in Asia? I live in Taiwan, and Tipping IS a city here.... Jokes..
Seriously tho, the concept of leaving a tip of any kind doesn't exist here. Taxis, restaurants, bars, etc, no way. It just doesn't happen. And trust me, having traveled around the world, the service here is THE BEST in the world. Intuitively, that makes sense. Do your job properly, and you get paid. It also helps that workers get paid a living wage, but that's a whole other discussion...
Anyway, I've never seen a tip jar over here for any live music, and we've never brought up the idea. There are lots of buskers with a tip jar in front of them, but you have to be get a busking license to play in public.
Yeah sorry I should have said Asia as well. We were in Vietnam a couple of years ago and everyone was so nice and the service was great you just really wanted to tip them. When you did they were shocked, especially in the north.