Just to clarify: When you duplicate a song, the copy will have a "1" after it (meaning the 1st copy). Duplicate the original again and you'll get a "2", and so on. If you duplicate the copy, you'll end up with "1 1". Either way, I'd name the two copies however works best for you, and keep the original on file elsewhere. Then, when the show is over, you can delete the extra copies.