At my wedding, I tipped the singers and pianist because they didn't charge for their services. I also made a donation to the church. As for the caterer and photographer, this was their job. They didn't work for a company so all the money they got over expenses was profit, so I didn't tip. I had intentions of tipping the bartenders because of the amount of work they had (we had 2 bartenders for over 200 people), but I did not. I asked them specifically not to put a tip jar on the bar and that I would take care of the tip. When I discovered a tip jar, I decided that they had handled their own tip and I didn't give them any more money. I tipped the singers and pianist $100 a piece and made a $200 donation to the church. However, this was in DC and that was the average rate there.