Oh this takes me back (only a few years ago) to "lip sync" at my college. We had everyone who wanted to be in the dances practice hard core, at least a month in advance. It's amazing what you can do with a little time but a lot of dedication. We used to tell the new members, "we don't haze, we do lip sync!"
It was a great time, bonding and laughing about muscle aches and bruises, and some of our sisters' lack of hips!