Tipping mut be an American thing.....apart from street buskers, and Edinburgh has its fair share of them......Performers over here in clubs bars and theatres etc get paid for their work and the punters would never dream of tipping......I have never used a tip jar or asked for extra contributions from the audience.....but I've had a few drinks bought and refused many to stay sober. On the other hand most acts sell Cds or other types of merchandise at breaks and after the performance.....some make more from cd sales than they do from appearance money. It is worth considering.

http://www.soundclick.com/bands/songInfo.cfm?bandID=687727&songID=5238055