See, the problem is that no matter what anybody tells you to play, somebody’s going to come busting in and say, “Nobody wants to hear that shit!” And no matter what you play, someone at the wedding reception will come up and demand to know what you think you’re doing playing such utter crap.
A whole lot depends on the crowd. The music Albert mentioned might have worked great for the crowd at his wedding, but at my wedding it wouldn’t have worked so well. The Outkast song would have gone over like an orgy during Sunday School. People would have been sitting there discreetly casting appalled glances at one another. Your best bet is probably to talk to the bride and groom, since they’re the ones most likely to have a feel for the group you’ll be working with. They won’t be giving you specific songs, of course, as they have roughly five million other things on their minds at the moment, but they should be able to give you a general idea of where to start.
Once you have that, the Dopers can probably make you a play list.